Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b44d2421f34417…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 09:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a950191d675c0cafc59e32339d84ab3 SHA-1: f230757e163a6b2252e00da0d94cf6ec29454f8b SHA-256: 10b44d2421f34417d6001a37cccc4c8042cab107086e4440e7a864d1bc582ab7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to distribute other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=benzodiacepinas+en+ancianos+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of multiple malicious links indicates a phishing or redirection attempt.

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=benzodiacepinas+en+ancianos+pdf
    • http://files.flyingmissionusa.org/uploads/1/3/1/4/131406885/3e9014.pdf
    • http://files.adventurehorizons.com/uploads/1/3/0/7/130739344/35c7529d23d.pdf
    • http://files.felicitasdoula.com/uploads/1/3/0/7/130776589/7122715.pdf
    • http://zurin.benbodnarfilms.com/uploads/1/3/1/4/131453541/9872883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/petopekuvefede.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/64157011411.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/53476444542.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/mizogizokenazivapol.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/pofogesesegov.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2269/files/avalon_hill_d_day_rules.pdf
    • https://cdn.shopify.com/s/files/1/0434/5371/0493/files/85635078964.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/80793893357.pdf
    • https://cdn.shopify.com/s/files/1/0434/9706/2564/files/ziferibojesozajisaxen.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/80966575586.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_off0000751e.bin
b91b54ce697ca4a80e09e3fb2a55a77a57f2f6023b12bedbbc422d8e69c09e84
pdf-font-stream PDF embedded font (sfnt) at offset 0x751E 5120 bytes
font_01_sfnt_off000086a3.bin
92fcfd3dd04e53a78404f08e29a1af4d445bccd6d600accfa8a703589d826dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 10976 bytes