Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cb85b9d913c3ad…

MALICIOUS

PDF

42.1 KB Created: 2020-08-05 23:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd88937bba75e763dc71a5af7a528d5c SHA-1: 4c21181fb8858e6b26cf630222e1ede040e7c558 SHA-256: 25cb85b9d913c3adff9537e821eca01363034a9896494c7d8b13a81691a4c282
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'category management purchasing pdf'. The presence of numerous links to Shopify domains, some of which are confirmed benign, suggests an attempt to blend in with legitimate content while hosting the malicious redirector. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attack.

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.com/pify?keyword=category+management+purchasing+pdf
    • http://files.martijoyoga.com/uploads/1/3/2/3/132303382/86466b8fc.pdf
    • http://files.groundcreations.net/uploads/1/3/1/6/131607010/ledakasuboxagage.pdf
    • http://files.nativeturquoisetreasures.net/uploads/1/3/0/7/130775506/bixajozilokufij-rokerigemerelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/48134000241.pdf
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/net_compact_framewor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7623/9014/files/54755410713.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4533/files/82673732609.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/bidarinebumojosakigape.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/youtube_to_m4r.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/72787337576.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/mowugomepepilawubugarixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/72092386590.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/44310935903.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/fabuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/34783623353.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/kosanimutik.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_off0000669d.bin
0a6acb13c078eb825013bad913e37a470ef310f0de5c6504f01288b3b29f5639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 5544 bytes
font_01_sfnt_off00007953.bin
185b4243c3f26e2faf0d324dfab036988b6e22792c95df589600a3c220b844d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7953 9972 bytes

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