Malicious PDF — malware analysis report

Static analysis result for SHA-256 3953cf6847a8bd31…

MALICIOUS

PDF

42.3 KB Created: 2020-09-28 16:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db75f65a6218b47ee5e9d7de67833266 SHA-1: a8b5886d4bb358a97c4604a580bda2d717968406 SHA-256: 3953cf6847a8bd315e4d0a41427e803db9793ef49509b76bf36448146b564d9d
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ggtraff.ru/mozel. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to this malicious site. No scripts were extracted from this sample.

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://ggtraff.ru/mozel?keyword=apprendre+a+lire+stanislas+dehaene+pdf
    • http://files.nextmanager.net/uploads/1/3/1/0/131070566/tidikew_jugola.pdf
    • http://files.rbcdublin.org/uploads/1/3/1/1/131164063/2863635.pdf
    • http://files.accoladesupport.com/uploads/1/3/1/8/131872054/aed496eb.pdf
    • http://bumikotot.kylieskitchencritiques.com/uploads/1/3/1/4/131437087/3560413.pdf
    • http://pexojibi.larkinpetersart.com/uploads/1/3/1/1/131163653/a3ca2601.pdf
    • http://mibid.fbcbellstx.org/uploads/1/3/1/3/131384605/susuzimajeko-jolebopusid-baxiseki-ketapefiwerem.pdf
    • http://files.getadvancedchiropractic.com/uploads/1/3/0/9/130969205/251035.pdf
    • http://korap.brucenyberg.com/uploads/1/3/2/6/132681656/funegowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/7006203980.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/2259394285.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/perotixojelusi.pdf
    • https://9bfebeac-cbe1-4dc9-a9a2-a350d86519a1.filesusr.com/ugd/d162e3_c6d5f2f9c4d94cedab0c5e824f6cc4d3.pdf?index=true
    • https://de1e6d57-d7e8-415e-95c5-46fe756add2b.filesusr.com/ugd/3e7897_98c52bc700af44f78441eac652d8d81f.pdf?index=true
    • https://b7fe62d9-ec2d-406d-908e-1b3d5940e8ea.filesusr.com/ugd/564d2e_c08dd6cade6244d8986cf3a5990bf281.pdf?index=true
    • https://35da3abc-c223-4c02-b14c-1974d1def959.filesusr.com/ugd/83b1b3_c670dc8bff9a40f8b466a2b962fbc812.pdf?index=true
    • https://47812fdf-48d6-4520-a160-2721be2cd82e.filesusr.com/ugd/ff3115_e89641d081304c2f8c6335d01485364a.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_off00006514.bin
03325f9e3829bdfddeb6de74d02b8ab8cf48de98cd4e0dc8e583ed32fc11cf89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6514 5120 bytes
font_01_sfnt_off00007679.bin
7c7289936443600ff14489c3e446e023b0d60bda90be3859286126ee069cd4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7679 11364 bytes

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