Malicious PDF — malware analysis report

Static analysis result for SHA-256 d432c7fcf4cb744e…

MALICIOUS

PDF

37.6 KB Created: 2020-10-13 08:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c93f786a879efe01c149bb6e4c88b88a SHA-1: 6191d67c1e6d0ec6be35d1060ac069c7466db509 SHA-256: d432c7fcf4cb744e865186c5413cd2dc14e51f74bbb2a84358ec92585c3b73a3
152 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://cctraff.ru/strik?keyword=logiciel+caisse+enregistreuse+android+gratuit'. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 3

  • 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.
  • 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=logiciel+caisse+enregistreuse+android+gratuit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/5248/4766/files/what_year_was_the_ffa_creed_revised.pdf
    • https://cdn.shopify.com/s/files/1/0498/8724/8538/files/52002079175.pdf
    • https://cdn.shopify.com/s/files/1/0435/5175/2344/files/bentley_workshop_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/ratoniwogu.pdf
    • https://uploads.strikinglycdn.com/files/978e2f27-c127-4274-a078-8684c90ae953/gixijobakirelozejuf.pdf
    • https://uploads.strikinglycdn.com/files/83951350-9e62-454c-b1e8-6e5c8cad2896/ropufowunaled.pdf
    • https://uploads.strikinglycdn.com/files/8e60e548-ba4f-4d3a-8729-a878810a1544/bubuf.pdf
    • https://cdn.shopify.com/s/files/1/0457/6624/6564/files/bryson_tiller_trapsoul_free_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/blender_2.8_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2323/files/idea_sld_eligibility.pdf
    • https://uploads.strikinglycdn.com/files/be5bad6e-080c-4162-9594-f52ca8a3f5d7/zorenetixubujeleratolajen.pdf
    • https://uploads.strikinglycdn.com/files/9fdff0c2-cebc-432e-895b-bb75560f23c5/buwofusizeludujikajeligi.pdf
    • https://uploads.strikinglycdn.com/files/1d732d54-e0f8-4573-a684-face65915bb0/fobora.pdf
    • https://uploads.strikinglycdn.com/files/da67eb56-b456-40d1-9c95-693e77b6d498/jesejumowevofogiw.pdf
    • https://uploads.strikinglycdn.com/files/4f18084c-e52f-4520-aede-70799a1d794c/bopivituzatoluv.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682e.bin
84f0247813b2ed972de5c47c6e6940033ede8f6e92602bc87b3480c65e2a06d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 5048 bytes
font_01_sfnt_off0000795f.bin
31552bfba4945e95a8a60962fa520437d156959e284d814bc19c2aca3e070292
pdf-font-stream PDF embedded font (sfnt) at offset 0x795F 11384 bytes