Malicious PDF — malware analysis report

Static analysis result for SHA-256 16afba42a6f56f8e…

MALICIOUS

PDF

51.6 KB Created: 2020-08-22 00:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34a43d9a8ba15cc2b343e3c05152fbc5 SHA-1: a5eab5ea3f50b5468fa50b91105f3c1570efb0da SHA-256: 16afba42a6f56f8e20c762dbed2b2e21fcf853966dce5bb4ab30fe04766e5ab4
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 pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=array+of+pointers+in+c+pdf'. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating an attempt to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=array+of+pointers+in+c+pdf
    • http://gipagal.lethbridgeelectrical.com/uploads/1/3/0/7/130776783/079b902.pdf
    • http://files.timeddefense.com/uploads/1/3/2/7/132740804/xevunutuvizepos.pdf
    • http://files.wayfaringbride.com/uploads/1/3/0/8/130813714/d5f7e62969d82ad.pdf
    • http://xisago.diamondlightworld.net/uploads/1/3/1/4/131437308/304444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/jowixefupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/55951142275.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/nirarit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7360/0678/files/gilulefize.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/wifinazexowefawupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4577/files/bevejal.pdf
    • https://cdn.shopify.com/s/files/1/0437/3089/4999/files/98279376991.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/gmat_verbal_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/multiplying_polynomials_using_algebra_tiles_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/12742260217.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/34474304627.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d59.bin
4ddf8d9db41783f141f13975880a61decde5c4e2e4c8a73b69b9dad7fe0b9a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D59 4996 bytes
font_01_sfnt_off00007e69.bin
e95e11ebd24189e9d72399a68a081df695647547274ac29d67c6cd0a8bf4dc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E69 16092 bytes
font_02_sfnt_off0000b160.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB160 4324 bytes

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