Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec54c2a4e4a8fd1…

MALICIOUS

PDF

36.9 KB Created: 2020-10-08 10:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a44bcbf71e99a0bc3cc8af655939ebb6 SHA-1: f65557048be7e470150c5b0972c0a7c63d0004d3 SHA-256: 5ec54c2a4e4a8fd100c9a1412d947701c55628d0d5188af156accd4561dc3b61
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the embedded links are the primary attack vector.

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://cctraff.ru/strik?keyword=printable+knife+templates+pdf In PDF document text
    • http://tojajixep.sacredkinship.com/uploads/1/3/1/0/131070374/xamomeferuzasemader.pdfIn PDF document text
    • http://tinabuful.nickydelariva.com/uploads/1/3/0/9/130969260/mudub.pdfIn PDF document text
    • http://files.fearlessfrenchies.com/uploads/1/3/1/1/131164210/besepo-xexonezamedem-legan.pdfIn PDF document text
    • http://files.pencilworksbyjoyce.com/uploads/1/3/1/1/131163512/57cbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4364/2792/files/god_of_war_3_remastered_trophy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1134/6079/files/bluetooth_gps_receiver_for_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5055/5799/files/possessive_nouns_worksheet_4th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0115/1128/files/mercy_thompson_world_reading_order.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5502/4790/files/56941476274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7373/2769/files/megaman_zero_2_forms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3877/9803/files/homestuck_class_quiz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5281 5392 bytes
SHA-256: cdf082d582005a6009fbc653ca6ce9e3a702fce01a01b245fd25b7b336264cbd
font_01_sfnt_off000064b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 10048 bytes
SHA-256: 8a36c234954bda2a3091f482a1aa862c0bc12659225c08ec0ead855a5951a51b

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