Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4001939cdeb5cee…

MALICIOUS

PDF

41.8 KB Created: 2020-09-21 14:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150d0692b53e0eabb8595497ef5d0745 SHA-1: f2e6c4eeb5f7780355938bd37bfcadf57c99687a SHA-256: a4001939cdeb5cee1c4b21d94a6ada9929b1421ceb65cc51631722c62fad9b38
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, includes the text "Le grand concours practice test level 3" and a URL that aligns with this lure. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file. The primary attack vector appears to be directing users to malicious infrastructure via these links.

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.me/wix?keyword=le+grand+concours+practice+test+level+3
    • http://zetugolar.spraysafeplaysafe.org/uploads/1/3/0/7/130775851/8708920.pdf
    • http://nisin.super-sounds.com/uploads/1/3/1/4/131438580/xenotuzagolevarif.pdf
    • http://files.stealth-phones-guide.com/uploads/1/3/2/6/132681611/zajedinunegup.pdf
    • https://c54d0d52-e7cd-405f-9257-6e5d86a840fb.filesus
    • https://cdn.shopify.com/s/files/1/0433/0697/5382/files/67428565881.pdf
    • https://cdn.shopify.com/s/files/1/0481/1862/8505/files/62478263212.pdf
    • https://cdn.shopify.com/s/files/1/0433/4708/3418/files/oxidation_reaction_mechanism.pdf
    • https://34eafad3-a7ca-44aa-819d-18c97ec03f70.filesusr.com/ugd/1be480_e7e032e53c72487aa0c02b96444c02d7.pdf?index=true
    • https://fd827bf4-4595-47e4-b1dd-3083cb3937b5.filesusr.com/ugd/0d089b_798e95f965974ab2862efad197b1df73.pdf?index=true
    • https://c54d0d52-e7cd-405f-9257-6e5d86a840fb.filesusr.com/ugd/5f226e_10acb650cceb4bb0b56fb2dd9b35cb23.pdf?index=true
    • https://16545196-68f6-4c1d-9665-fe262966e767.filesusr.com/ugd/d63aaf_55db2e04750c4e82aaf29599f9bac7bc.pdf?index=true
    • https://805651c7-b23d-4a3b-b026-2ca73256c4d2.filesusr.com/ugd/55f640_d677e09275c741789ee6922bd399b0fe.pdf?index=true
    • https://e889e44c-91e8-413a-884c-32469da3bda4.filesusr.com/ugd/f95141_b73411d42a00442685200360939f7ca9.pdf?index=true
    • https://a9cc8cb8-49fc-4411-bb51-741dacdd1e75.filesusr.com/ugd/36f25b_c3b9e72b992741e3acc0ff358a115fa3.pdf?index=true
    • https://8013f0b7-48c9-4b0e-8152-2f4ca4b090da.filesusr.com/ugd/d63aaf_506d7448d5224ebfa623c76f35406d2f.pdf?index=true
    • 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_off0000627c.bin
c89bf3fcba72bfe3606650d2c73ea79bf0d0dcaa5240ecc8ab723c7e223479b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 5408 bytes
font_01_sfnt_off000074fc.bin
7950743ddc9f4fa1c9f21403ad65803a696fc0301f43f64f6132244dbb217dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FC 10724 bytes

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