Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ec66d2ea3921e6…

MALICIOUS

PDF

48.5 KB Created: 2020-08-11 15:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432e9862e22011508ef81be691521673 SHA-1: 251f214de72c288f9d8585e721a808a5dcbbdaeb SHA-256: 67ec66d2ea3921e6a82a724e6b658890b8f70ce2f4c7f17c7b18d81900fbe23b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=bollard+detail+pdf`. Additionally, it features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains a URL that appears to be part of the link farm.

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=bollard+detail+pdf
    • http://files.dynamogymclub.ca/uploads/1/3/2/6/132681891/pofidaw_duxago_lidinewotonose.pdf
    • http://files.shakespeareinjc.org/uploads/1/3/0/7/130775123/6927768.pdf
    • http://dexurede.melnieves.com/uploads/1/3/2/6/132681352/xapesawinaxa.pdf
    • http://files.themessageofjesuschrist.com/uploads/1/3/1/0/131070171/jogovox-paxibevimu-kusuzoxina.pdf
    • http://files.sarkabuchlstephenson.com/uploads/1/3/1/1/131164573/adba6edd49064b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/rajibezuwine.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/la_pasion_segun_antigona_perez_completo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4342/files/85940512002.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/xabolofagoxema.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/introductory_statistics_10th_edition_weiss.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/luleraga.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/kubewejusanomusokije.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3639/files/84891428977.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5934/files/obecn_a_anorganick_chemie_klikorka.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/35342803464.pdf
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/gafokovivifogafede.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/vefatuduje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0954/files/kerelakujeliwovam.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_off0000813e.bin
514dfde09776f3e3f4dd7bf72b5a7e47f702b31b012ac2bc12c35ce71ce881f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813E 4908 bytes
font_01_sfnt_off000091fe.bin
8eea1e0315f15ccd83568be1f30807c5863605ea7773e6fda19128384b978858		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91FE 10328 bytes

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