Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2ac94f7af7075b…

MALICIOUS

PDF

46.2 KB Created: 2020-10-24 08:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 676dc46755930910715b043406872906 SHA-1: 98728ae0d2f14f4a619e5289d8884ffe034e401d SHA-256: 9b2ac94f7af7075be38358b7a9c4380baa3f122f961c6814055b08fb6c122a4b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector URL, identified as malicious. The document body and heuristics indicate a lure for downloading software, likely a trojan or unwanted application, using SEO tactics. The ML classifier strongly supports the malicious nature of this PDF.

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.com/123?keyword=99x+game+booster+apk+mod In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f9395127c14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f8e1a7c860d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8a84bf033fb.pdfIn PDF document text
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/ef7b53a36feb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8b15f0e557c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f87bea7b6e71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f9214fe75559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8921f02022c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8aa4cd99734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f8e8a8884c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f8e2e0090eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8aaf45031b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8800a06065f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0002/0130/files/43639168849.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8506/9477/files/16990511788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7981/0203/files/photo_editing_apps_with_text_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0073/7187/files/sivilarivofazudozifux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8214/6497/files/65355463734.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7887/6829/files/20826673943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/quick_and_garran_annotated_constitution.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5034 5580 bytes
SHA-256: df606525dbee9d0ebcd56c521751cdaf5d91280e6ca2a95e56e4f1c32944ba3d
font_01_sfnt_off0000630f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 3236 bytes
SHA-256: 563547cb86281a678fa73f683665f957e89e3320ca6c46a394175a33f261efe3
font_02_sfnt_off00007033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 10364 bytes
SHA-256: 9836cb70b147847edf33ead23229e5fb4e0289eeee7cab4113cbc7f8f6f22cb2
font_03_sfnt_off000093d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D4 16204 bytes
SHA-256: 70d286a96435f9e1132771529d7b3d79f51b61ea3a89d3ea2c235474d063bf78