Malicious PDF — malware analysis report

Static analysis result for SHA-256 f996590b9c05b806…

MALICIOUS

PDF

40.7 KB Created: 2020-08-27 15:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218186b5ba99bcb1304656c8ac628baf SHA-1: b8f5defc3042c9245eae25565c88504de0063b09 SHA-256: f996590b9c05b806c4c384c2ebc0697c711022dd2f9b01ade0f4e48ff5cb0a5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=gta+4+cracked+servers'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning tactic. 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=gta+4+cracked+servers
    • http://files.dj-imba.com/uploads/1/3/1/1/131164520/2062280.pdf
    • http://files.risacromer.net/uploads/1/3/1/4/131454098/042128f6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/wazosegiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2904/files/knee_exercises_for_arthritis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5035/2296/files/35171565420.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/waruwerebotibogazabexeri.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/akhund_darweza_baba.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/free_printable_coloring_sheets_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1546/files/roxofoforetimavikokel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5492/2902/files/labosuwovujariweleg.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/56662441765.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/jamur_beauveria_bassiana.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d4b.bin
7fe9ad9f74751159cf12265ed0fcdcec232185b028a15e050d2d03f62838a67e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4B 5144 bytes
font_01_sfnt_off00006ef4.bin
600091561b3efb58e34ef13d91e0fedc19a66e10e87c6cb25f75f66824f362fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 12200 bytes