Malicious PDF — malware analysis report

Static analysis result for SHA-256 19868fa956526a79…

MALICIOUS

PDF

44.2 KB Created: 2020-09-01 00:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a96d75b5db03dc1f445b3a6ed1649d0b SHA-1: b4da02b66f54955bef7766f1062eacf3139c4430 SHA-256: 19868fa956526a79f91238c563185a3c2e961c22c441e179d13e9180fbc2f9fc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, 'https://ttraff.ru/wix?keyword=multiplying+binomials+worksheet+pyramid+puzzle+answer+key', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, reinforcing the lure of a worksheet answer key to disguise the malicious redirection. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a phishing or malicious content delivery attempt.

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.ru/wix?keyword=multiplying+binomials+worksheet+pyramid+puzzle+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/vadenegivad.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/bible_in_gujarati_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/live-_server_command_not_found.pdf
    • https://static.usrfiles.com/ugd/87fdc7_8d71ff128a514431b031ee23571e1032.pdf
    • https://static.usrfiles.com/ugd/b8c837_133699766a68417d99bdd95685438f55.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_066e523f033640649849740d4b6dad21.pdf
    • https://static.usrfiles.com/ugd/10e3af_348f780c85b343fdb0a7719fbcfbde8e.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/jazojoratideli.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/43787327382.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/94368555469.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/nissan_forklift_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9226/3583/files/ap_mundo_600_bce_a_600_ce.pdf
    • https://static.usrfiles.com/ugd/12daa7_9bc783443d0842f3be518ab23f5891fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b108230562347539ad7fd8dc3a98b38.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e9fc9db0e64478096045226b572b620.pdf
    • https://static.usrfiles.com/ugd/9a242c_575d6be3b924412cb36424a76eabeea0.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_off00006324.bin
dc870517c1d18fdd41417a002d49c86471c42dc2a28276d7c0fb6fcead02dc89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 5828 bytes
font_01_sfnt_off000076f0.bin
e783195b4670a106e1609df97f1c3a3e4ec691f5d13bf9e6879834d7fa0540b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F0 14536 bytes

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