Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a397933df10f295…

MALICIOUS

PDF

48.7 KB Created: 2020-08-06 18:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f023be0dfe3bf605414c89ed86785ea4 SHA-1: 3cb67cccd5aae4416ef42b41558224820e3b8402 SHA-256: 6a397933df10f295e884f513b7bd62878aa1927fa337ac2e743f8b0ce9a94c08
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a search result for a downloadable PDF. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to drive traffic or distribute content. The 'SE_REMOTE_SUPPORT_LURE' heuristic, though not directly supported by the DOC BODY, suggests a potential pretext for further malicious activity if the user were to interact with the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.cc/pify?keyword=basic+english+grammar+azar+pdf+download
    • http://files.keepafallenstar.com/uploads/1/3/0/7/130776592/439d1c.pdf
    • http://files.widdershinsinspirations.com/uploads/1/3/1/3/131384101/bae8c308580fea.pdf
    • http://files.tammybiggsgymnastics.org/uploads/1/3/0/7/130775475/522de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/emotional_intelligence_self_assessment_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/6074/6648/files/andromaque_rsum_court.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/88924526421.pdf
    • https://cdn.shopify.com/s/files/1/0439/4765/5323/files/bemuvokofalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/56056194835.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/kexuwepa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/dexowulosototumed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/bibusef.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/dogojotudi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2484/1890/files/74771079676.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/mathematical_analysis_s_c_malik.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/fufutenoretadomopujekef.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007428.bin
6a5952b408fb69afdc5d7ab4081f714fde442b7b4f34d2d758ca0a1ef7d3b21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 5760 bytes
font_01_sfnt_off000087b2.bin
3afc34ad0f7c5b3f3f9e7a5873d0a492f9c18fa8894da9d383260b0b1238aa47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B2 14896 bytes

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