Malicious PDF — malware analysis report

Static analysis result for SHA-256 f173401e23dc92ec…

MALICIOUS

PDF

44.7 KB Created: 2020-10-04 08:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0dc80dc412f4ce33327f3283df07e16f SHA-1: 520f2cf6e0d0c2f5c73b29bbd233db8365eb4993 SHA-256: f173401e23dc92ec9fc008f31b15fce2981b4cf4053d38639c8eb36c7f5eccfe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' for an accounting textbook, likely a lure to encourage clicks. The presence of numerous external links, many pointing to benignly hosted PDFs, suggests a link farm or SEO poisoning tactic to drive traffic to the malicious URL.

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://gettraff.ru/strik?keyword=intermediate+accounting+2+valix+2019+answer+key In PDF document text
    • http://files.sydvjewelry.com/uploads/1/3/1/4/131437308/dulelotedifo.pdfIn PDF document text
    • http://files.rainshadowarmory.com/uploads/1/3/0/7/130775200/befujozedesifira.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/8ae6fe15-afa9-4b1a-9640-c6b2c0266e21/bupotibijezogewem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e5cc8b-78f2-4dd8-83a1-dd70b02cc73a/sadexubenufonajuvuzuxafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941bbd0b-0a50-428b-a088-acff18d1fbf0/pubagakajugenikox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574f9963-e9ee-48bf-ade7-148085f17337/seviro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6180d43e-0637-499e-be4d-949ba20a3c9e/97157737203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf7b280-eb8a-4e8e-8c7c-3855d899c6ab/risupoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6a0c8a-8171-4597-9705-8bdfa380cc4b/rovumominagaxujegedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c445f5f-61ed-49c1-8580-3dbd280a4184/ruwuwupipekugavev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51cdf03-8ee2-4a50-b6b3-aeb77d095cd0/pakusukataxadetuniwarafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7092b4-da03-4572-8b95-5b69ec502ebb/fezelivukaxifimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08f3234-e73e-4e2e-90c4-4527b8074e6b/karafemizulopexef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55f2eb5-dd74-416f-9fce-50ddf9562529/98052876370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7134fa3f-13fe-449f-a252-651fcb654e6e/33055357631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f3d6e8-cf0d-44bd-90c7-050dc7faef64/51579482885.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_off00006dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC3 6064 bytes
SHA-256: 6e7f81d6bf99f8e22cbef497eede71d13810d5cb4c7199249ac847ef224b692d
font_01_sfnt_off0000826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826D 10296 bytes
SHA-256: 15025c4dc0f038f0b067f14eb86998fa8c986d4d48a7dca9ecd80d365a1a1e3a

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