Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dd4d736b89c174…

MALICIOUS

PDF

53.3 KB Created: 2020-08-11 07:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eacc2f7b2c549dbcbf7be44b70bb59ad SHA-1: 7114776bfd22a19e1b8e94f95f6d6344c08c235f SHA-256: 67dd4d736b89c1742f66cf864077f2f3da9e8ae3fa6611dca2d5177026d7378a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains a reference to the same URL, suggesting it's a primary lure. The presence of PDF-specific heuristics for malicious links and link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=eat+nutrition+guide+bikini+body+burn+pdf
    • http://files.daybreakersolutions.com/uploads/1/3/0/7/130775987/addba17.pdf
    • http://jimilel.sydneymilitaryofficersspringball.com/uploads/1/3/1/4/131453598/2836334.pdf
    • http://files.winzerlodges.eu/uploads/1/3/1/3/131381605/namusabawelelalebine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0519/6957/files/zasirowapiwuguni.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/maxwell_maltz_psycho_cybernetics.pdf
    • https://cdn.shopify.com/s/files/1/0432/7545/2569/files/26262524991.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/4018217028.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/maxusug.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/zokutijoxaravimasab.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/rudizan.pdf
    • https://cdn.shopify.com/s/files/1/0437/3564/6357/files/wuputigijovazunut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/zigolejirisikano.pdf
    • https://cdn.shopify.com/s/files/1/0443/8127/4278/files/lcs_academy_standings.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/managing_information_technology_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2645/5455/files/33884145159.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/biotic_and_abiotic_components_of_aquatic_ecosystem.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/86213201152.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3462/files/48411864656.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_off00009236.bin
2c324688c3a943aecd7ce1394ab7e32d69e58d73dab40f46aa5bbe97a75a3f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9236 5260 bytes
font_01_sfnt_off0000a437.bin
3cff6d4898ba421845fbbb705373764bd35a799c6cb89b3493db8bdd42ab4102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA437 10480 bytes

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