Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a173ddaaa9ead10…

MALICIOUS

PDF

45.9 KB Created: 2020-08-25 15:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7474483016a1267b29495227a646593b SHA-1: f4beadfd83ff477977a6c019bfe3dfb368456f7e SHA-256: 6a173ddaaa9ead1025a44482430f7051371a50399cd92ee27d38722eeaf2c1cc
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, but one critical link directs to a known malicious redirector. This suggests a tactic of using link farms for SEO manipulation or to distribute malicious content. The ML classifier also strongly indicated maliciousness, supporting the presence of a malicious redirector.

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=baddha+konasana+information
    • http://kemase.arclatin.com/uploads/1/3/1/4/131406749/deduv-rofagijeb-posazusabote-tedudeg.pdf
    • http://files.acornequalityfund.org/uploads/1/3/1/6/131636903/lobez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/how_to_add_people_to_discord_call.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4099/files/goxowejanarurowepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/14259347681.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/hueco_tanks_guide_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/fujejojezetedemanewepo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8840/files/97239065160.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/27691610646.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/9860273940.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/futolubupevuxejaxegotemup.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/devulirelisufomafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5422/7871/files/35960302250.pdf
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/73290623974.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/16874461475.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_off000064eb.bin
b0936b6c24e02cc76ee2a151fc33ce2bf81e97b3f84bebcf7e02d2b7a662d85b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 5228 bytes
font_01_sfnt_off00007680.bin
6f82c1f74bad6793c03c775a525be771fad83eefa3a6f4d1ee13d863e1224c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7680 10076 bytes
font_02_sfnt_off00009937.bin
9c9318c459425519d8d9ded8370ad812aa4125b86e58eee0884ea28f1c46d8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9937 4168 bytes

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