Malicious PDF — malware analysis report

Static analysis result for SHA-256 187e5f6a4c2eb368…

MALICIOUS

PDF

47.3 KB Created: 2020-10-03 20:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fb3beec5f59b2e4f160783b0b6593919 SHA-1: f27aaaebc37039dd84c18a3ce5f08ed4e0557193 SHA-256: 187e5f6a4c2eb3682102388780ad8bccdf270918298b40517bbdd86243fbb88e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains references to game-related terms and URLs, suggesting a lure. The presence of numerous external PDF links, many hosted on platforms like strikinglycdn.com and shopify.com, indicates a link farm designed to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=driver+san+francisco+steam+key In PDF document text
    • https://site-1040280.mozfiles.com/files/1040280/julijagofow.pdfIn PDF document text
    • https://site-1040595.mozfiles.com/files/1040595/bafinig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0de55ed-e27e-4284-a3eb-bc29cc76a4a7/93935623231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b778ea87-da39-468f-a02f-8356c7546e22/fededidawolawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b784a87-5a5b-43d8-b47a-7dda43df142d/96880271347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0824cd66-aea3-4953-89d3-220465385829/98203800770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3950/1735/files/73367072251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/easy_anime_cosplay_female.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7503/4524/files/little_dragon_cafe_huey_walkthrough.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/22361877419.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/gomexiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6646/1853/files/81402402703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3379/1144/files/40170823876.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_off00007b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 5220 bytes
SHA-256: 96d8f6a317b8ae9730667f625d3b550c0a3a891ec3e3b5dd038e37677b1e46df
font_01_sfnt_off00008d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0F 10380 bytes
SHA-256: 3ac59da5d416c862de6673810ca1cb116c3e8752892a01e67bf0bfa08233d6de

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