Malicious PDF — malware analysis report

Static analysis result for SHA-256 669b8967d57cc2ef…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 11:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ab8ce098e29c063427672b2e8da11ce SHA-1: c37b32ab248fc343a36f888477c21be62ae4d162 SHA-256: 669b8967d57cc2ef1268e9e4a89eb99fde5abc92bd98f995c03209356eab9c93
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a link farm, indicating it's part of a larger SEO manipulation scheme. The document body, though heavily obfuscated, contains a URL that appears to be a redirector for a scam. The presence of advance-fee scam lures and urgency language further supports a malicious intent, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/wix?keyword=entrepreneurship+successfully+launching+new+ventures+purdue
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5fd5c1_51667dfdb0f2408c99f5496248e38dfd.pdf
    • https://static.usrfiles.com/ugd/93971e_9c294f45dd234767baa8f7795fd339ab.pdf
    • https://static.usrfiles.com/ugd/9c43ec_87d222c05e674c509d41e0eb8e694805.pdf
    • https://static.usrfiles.com/ugd/913720_2837f3029cdf429aa63cb9637b1fd30d.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/memupipemejoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1070/files/jifowijoxagete.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/mcgraw_hill_answer_key_algebra_1.pdf
    • https://static.usrfiles.com/ugd/a86d68_1b1115b6d7014e2fb5f0f82adeefa64d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf741a8d945f49c5a699f7df45f2abdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_24841f9d180540919a1375c8fd60701a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a52eb78221f4fe49f00f493dab48e00.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0a.bin
fc3c3822f934ad138193e24bc2f98362621536f2fe76e5bb9d15c1cbbd838cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0A 5628 bytes
font_01_sfnt_off00007248.bin
55f9c8454b68f047c0e522ec819f9ba570c6a4b554bdeb0e20ce531b13cfd465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 10208 bytes

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