Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7a89c313de1ca4…

MALICIOUS

PDF

48.5 KB Created: 2020-08-16 15:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6926184d12d17ce4ee19ee42bbde185e SHA-1: 7f79ccf5d3f0974ab22f6b8b4c5f61b70e8a4855 SHA-256: 0f7a89c313de1ca4066b5ec854e67d18aa639b5a1c89347e6ef74b3e1f73a2b5
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users to a compromised site. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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=schistosoma+mekongi+pdf
    • http://zonen.everythingconnects.org/uploads/1/3/0/8/130814297/3727131.pdf
    • http://files.highclasswhoopass.com/uploads/1/3/1/6/131636941/4606565.pdf
    • http://files.faithfullygc.com/uploads/1/3/1/0/131069764/33061c9.pdf
    • http://wigusij.learnabouthmong.net/uploads/1/3/1/3/131380213/196230.pdf
    • http://basan.embarrass.org/uploads/1/3/1/0/131069934/7701073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/28332839306.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/geografia_e_arqueologia_bblica.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/mcse_certification_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/pixuvixanesisod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/dissertation_guidelines_uom_fema.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7383/files/22336003588.pdf
    • https://cdn.shopify.com/s/files/1/0428/4429/1228/files/carer_allowance_centrelink_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/ludulomifepaxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/55019217543.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_off00007e5a.bin
139bb0b7dab0fe08864bba40afd98b7b2c5b48aa4a97dde878a7629ad89442d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5A 5608 bytes
font_01_sfnt_off00009146.bin
d4c8d74e46eb418de846069fe6464b4cc8574f4879a88ddd730ef7fe1f89b99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9146 10744 bytes