Malicious PDF — malware analysis report

Static analysis result for SHA-256 291a62c098e3d847…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 19:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c4a8b9640153af7abf703f4ca3a0768 SHA-1: 0a287073b7093071720f267da0abfbb12e94bba5 SHA-256: 291a62c098e3d8477fa2c4a8051067eb034a7a31240a84780241ad67b6ac818f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=sample+college+algebra+problems+with+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'sample college algebra problems with answers', suggesting a lure to entice users to click the malicious link. The PDF also hosts a large number of external links, many pointing to benign-looking PDFs, likely part of a link farm to improve search engine ranking and distribute traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=sample+college+algebra+problems+with+answers
    • https://static.usrfiles.com/ugd/e3ff21_d7c414bbf778409080be2c753c8d12fb.pdf
    • https://static.usrfiles.com/ugd/930050_2eec01c8102f4fe687264f537ee6471e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7044fa1985aa484a947f36886fe0554c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2be55c7e8b444c1fa019757a913632e9.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/best_utorrent_settings.pdf
    • https://cdn.shopify.com/s/files/1/0464/1387/3320/files/8277089358.pdf
    • https://static.usrfiles.com/ugd/8b9728_01e6d9ba9a9c425586dec48f6aec3331.pdf
    • https://static.usrfiles.com/ugd/e42ee3_c4d2be91e5e64d6da61be8465147e7c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fb0485d9fc746c787d23e5200cb245e.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b78.bin
a656cd5a0189e238221a6cfba047863ffea8128702c4188929db59b5610f3097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B78 5680 bytes
font_01_sfnt_off00006ead.bin
5355e7ef913b06dadf040dc36b15707f6beadccfef93b117273a5c985ec98a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 10292 bytes

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