Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dccac1936744f37…

MALICIOUS

PDF

45.4 KB Created: 2020-07-18 21:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 4cb507583b0145af9dd59e79fca9b6b8 SHA-1: 162bafee131b5b93fc44a2e815f547f93e340bd9 SHA-256: 4dccac1936744f37e22ba985b422ead9e005f55bfe7868c5b54f55f95af9611a
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a link farm, designed to redirect users to external websites. One of the primary links directs to a known malicious redirector, ttraff.com, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to a worksheet, likely a lure to disguise the malicious intent.

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/wb?keyword=gymnosperm%20and%20angiosperm%20worksheet In PDF document text
    • http://files.seanhuttonmusic.com/uploads/1/3/2/6/132682655/3cda6b7f4f1a1a1.pdfIn PDF document text
    • http://files.teachingandlearningwell.com/uploads/1/3/1/1/131164351/lekajabufuj.pdfIn PDF document text
    • http://files.sinisterkiss.com/uploads/1/3/0/9/130969435/zavafiviredatek.pdfIn PDF document text
    • http://files.dianeperell.com/uploads/1/3/0/7/130738596/7381900.pdfIn PDF document text
    • http://files.krasnoevents.com/uploads/1/3/0/7/130740252/9037144.pdfIn PDF document text
    • http://files.alexanderassociatesllc.com/uploads/1/3/1/4/131483685/bb51e77dd0c781a.pdfIn PDF document text
    • http://files.baguiosoundsrental.com/uploads/1/3/0/7/130775856/jubafipasubaza-matizonenir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ruzugebemem.files.wordpress.com/2020/07/26393575223.pdfIn PDF document text
    • https://budizuboj724492172.files.wordpress.com/2020/07/xokubefuloximu.pdfIn PDF document text
    • https://vosafeviba.files.wordpress.com/2020/07/vejopijomapagavo.pdfIn PDF document text
    • https://nirakopifaz.files.wordpress.com/2020/06/80424724512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/monarukovixutoxiwanagad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/41317888733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/kazuvodakitolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/58903053293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/78515897403.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/55430331746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2190/9667/files/58890032608.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000737b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x737B 5416 bytes
SHA-256: 74407872bc710e11ecb0c89fdfa222d8667497cf2ff8ac4d7f0c2e6fecdca76f
font_01_sfnt_off000085d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D4 10140 bytes
SHA-256: bb3c918de17ae2dd0fed5901e8cb5217bfbe61ea954b966d4820f7df0d9488b4

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