Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10508e81058b465…

MALICIOUS

PDF

43.0 KB Created: 2020-08-14 09:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1794d74c82b179d13c70dbb570603bc9 SHA-1: fb3d398c688b0b8a5dbf4def0e8551c81b0683be SHA-256: a10508e81058b4658c98e50dd8667c8d0772564e8d9d49b964d12bc0485c076b
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which point to a redirector service. The ML classifier also strongly indicated maliciousness. The document body contains a reference to 'bandos attacker guide' and a URL that appears to be a redirector. The primary attack pattern involves luring users to malicious sites through a link farm.

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=bandos+attacker+guide
    • http://files.northsideenginecompany.org/uploads/1/3/2/7/132712508/284c52ede41e37.pdf
    • http://files.landerbodyworks.com/uploads/1/3/2/7/132710795/a115fe8cacc273.pdf
    • http://fabotonen.aera100.net/uploads/1/3/2/8/132814930/soliwasemavifuboguf.pdf
    • http://files.renew-wellness-center.com/uploads/1/3/1/3/131398268/wikebaruvuxenizoxuro.pdf
    • http://files.ceoyear.com/uploads/1/3/0/8/130873795/kulubobop.pdf
    • https://cdn.shopify.com/s/files/1/0439/7151/0430/files/7342063066.pdf
    • https://cdn.shopify.com/s/files/1/0454/7680/6808/files/medical_leave_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/letter_from_birmingham_jail_critical_thinking_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/2362/9477/files/texoxejadisudugek.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/refurbished_at_t_android_phones_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/mibezegola.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lenibokufilitixesokan.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/63587389102.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/xaxopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/dudomojanakodos.pdf
    • https://cdn.shopify.com/s/files/1/0451/9958/9527/files/bls_manual_aha.pdf
    • https://cdn.shopify.com/s/files/1/0447/2160/2714/files/problem_solving_process_in_social_work.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_off00006b20.bin
b38d83c333e5e55031502740efd92310b6c981e49ffb56b35dedff2c96bc88a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 5188 bytes
font_01_sfnt_off00007ccf.bin
e90e7c7b8ed130343b3cc7ba92203e0063fe6326aa42304d4d95c5d7e8fc9316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCF 10056 bytes

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