Malicious PDF — malware analysis report

Static analysis result for SHA-256 039fe1345a92e343…

MALICIOUS

PDF

40.9 KB Created: 2020-08-28 07:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f8135fa372fc8da9e6ae41a761ae39 SHA-1: 76243de7440226977bffc245ae431734fcdbb036 SHA-256: 039fe1345a92e3438d33327e4e3cdb8a5a8ccd14d76b10eb3bec4da1a4a99c6f
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 a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=warframe+how+to+increase+mastery+ran
    • http://birava.wyomingsaddlecompany.net/uploads/1/3/2/8/132814930/sawarimulujisixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6422/0055/files/suruwiwakuvofiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3718/files/25043538006.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/best_biceps_workout.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5552762143.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/57798057403.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/96394372298.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/wovobowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7613/2774/files/channels_of_communication_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2546/3456/files/arundhati_tamil_movie_songs_free_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9878/4422/files/44449247436.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/dobebizovodebujiru.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_off000061b5.bin
4228de6d0161f9d1e30c8f3afdee5a4b4280bdd97aa354158b5697d98417b526
pdf-font-stream PDF embedded font (sfnt) at offset 0x61B5 5296 bytes
font_01_sfnt_off000073af.bin
50cf8ce06fa8c27b34518a399ac1a57bd566d638c5de1ef7e2874e64b427a5e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x73AF 10328 bytes