Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7b2ca0a64ff52b…

MALICIOUS

PDF

53.1 KB Created: 2020-11-05 10:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0ed04d4ef390afbfcb76ae092082cb6 SHA-1: 739afe9f614754af28cddea6dfd3660fd2cf5701 SHA-256: 2f7b2ca0a64ff52bfc6160a6c813aae3d089d15d79d6ee35a696047da60047b5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/strik?keyword=red+elephant+club+huntsville+al'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 'https://s3.amazonaws.com/waxejajinigafu/section_2_conservation_of_energy_answer_key.pdf'. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link suggest an attempt to lure users to malicious infrastructure, likely as part of a phishing or scam campaign.

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://gettraff.ru/strik?keyword=red+elephant+club+huntsville+al
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f963769638a4.pdf
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/67d6e6.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5f98742233ede.pdf
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/vagaxu.pdf
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5f9b0e0fe9455.pdf
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5fa1849b0563a.pdf
    • https://gebaxugore.weebly.com/uploads/1/3/4/5/134594027/mitikegi.pdf
    • https://jixobufasov.weebly.com/uploads/1/3/4/3/134324480/3b90915c0d34.pdf
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5f9b970aae03f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxejajinigafu/section_2_conservation_of_energy_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0500/0554/1015/files/japometogobiwefemaj.pdf
    • https://uploads.strikinglycdn.com/files/fb220051-0a67-47a0-a695-472f650a5038/chinese_primary_school_textbook.pdf
    • https://s3.amazonaws.com/begijufadi/niromimixabe.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_off00008f4f.bin
58dfe861e48c1d22d79e5d8229a3f17c26a5acd83157d1205d19d501ae37b3cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4F 5272 bytes
font_01_sfnt_off0000a13d.bin
4f09100f3e23cdd7ff8e299f49dda65d822dd78e2d2c96c62836908ecb10037a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA13D 11360 bytes