Malicious PDF — malware analysis report

Static analysis result for SHA-256 8786866ad8fe61e7…

MALICIOUS

PDF

40.9 KB Created: 2020-08-10 12:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b10f39c6f3312fb3b7c6f53b913cbab SHA-1: 4ddd4d034df8b9a2f96905f13d024af229096a5d SHA-256: 8786866ad8fe61e74105054f9de8e561efefc6f086ef6d908a4df0e53c743d6d
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 link, 'https://ttraff.cc/pify?keyword=bls+guidelines+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating an attempt to lure users to malicious content under the guise of "bls guidelines pdf". No scripts were extracted, but the presence of a malicious redirector and the link farm heuristic strongly suggest a phishing or scam 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.cc/pify?keyword=bls+guidelines+pdf
    • http://files.caninesforcharity.org/uploads/1/3/1/4/131406473/keripojabesufoniza.pdf
    • http://letejupo.buenasaludclub.org/uploads/1/3/2/6/132682883/0f7f35607f.pdf
    • http://files.seethetriumph.org/uploads/1/3/1/3/131383247/135ae4.pdf
    • http://biverone.bbqpete.com/uploads/1/3/1/4/131437246/sebopuduri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/jimejukizubunubi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0180/files/vajowamumobara.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0919/files/92087076594.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/check_if_a_number_is_prime_python.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/vijiwoken.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/16664771943.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/55417948982.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/7702883521.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3690/files/60073264643.pdf
    • https://cdn.shopify.com/s/files/1/0431/0764/7639/files/13541878163.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/ratepinivetewov.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/mekut.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_off000064c7.bin
f6e023672d30c16e3e4effa97865741b937b99b2c425b812d52a6bb06b73004a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 4952 bytes
font_01_sfnt_off000075c0.bin
458f405c60c1bafc50164a7a2065026c3daa0b6139bc30ce5848426e7cf3271f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 9616 bytes

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