Malicious PDF — malware analysis report

Static analysis result for SHA-256 991d78c310e67609…

MALICIOUS

PDF

52.9 KB Created: 2020-07-09 09:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 63f547d24f063deaa70240422030f775 SHA-1: 4a2fd5da267d8358aab1bbebe9a31ab5ace6aa53 SHA-256: 991d78c310e67609b354814082ccb26df102ae2273ab356d0ba368edf5c0b0df
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a PDF SEO link farm. One of these links, 'https://ttraff.ru/wb?keyword=combinatorics%20solved%20problems%20pdf', points to a known malicious redirector. The document body appears to be malformed or obfuscated, but the presence of numerous external links strongly suggests a malicious intent, likely to drive traffic to malicious sites or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=combinatorics%20solved%20problems%20pdf In PDF document text
    • http://files.mewellc.com/uploads/1/3/0/9/130969503/dogup.pdfIn PDF document text
    • http://files.williammonaguenativeart.com/uploads/1/3/1/6/131637919/vapurisadeneju_votatujitonufi.pdfIn PDF document text
    • http://files.papasroast.com/uploads/1/3/0/7/130775846/32c77da20eef.pdfIn PDF document text
    • http://files.sdbvl.com/uploads/1/3/1/4/131405940/libikos.pdfIn PDF document text
    • http://files.onyxfuneralplanning.com/uploads/1/3/1/3/131380413/pofadajigivep.pdfIn PDF document text
    • http://files.boomingbloomsco.com/uploads/1/3/1/4/131453946/4307245.pdfIn PDF document text
    • http://files.islandbeautyportland.com/uploads/1/3/0/9/130969243/522dd448b29a.pdfIn PDF document text
    • http://files.chrisnorrisart.com/uploads/1/3/1/3/131380138/3b57b547b506.pdfIn PDF document text
    • http://files.safedrivingschool.net/uploads/1/3/0/8/130814145/wonumufasa.pdfIn PDF document text
    • http://files.redrockfurniture.co.uk/uploads/1/3/0/8/130874458/kobixawigifim-nogamurafiwa-jumofuvozakiso.pdfIn PDF document text
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bilebapajaji.files.wordpress.com/2020/07/vudofasijivaposoloxijezo.pdfIn PDF document text
    • https://jazasugi116120722.files.wordpress.com/2020/06/mobevibusuwimudikinevix.pdfIn PDF document text
    • https://viledegup.files.wordpress.com/2020/07/18469553088.pdfIn PDF document text
    • https://noneboge.files.wordpress.com/2020/07/fufobefekatawuzerotum.pdfIn PDF document text
    • https://japofab.files.wordpress.com/2020/07/84651647487.pdfIn PDF document text
    • https://sapidumejofu.files.wordpress.com/2020/07/viwijez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 5312 bytes
SHA-256: b5a7330c8f633e05b93904a144126578493015564fe4500d85f6d6caae2d049f
font_01_sfnt_off0000893b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893B 12308 bytes
SHA-256: 29967bdfadded0600afa6cae8e02a7a723839e83aba9ebe551341aee7ccb6cc6
font_02_sfnt_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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