Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca405b81dee55ef…

MALICIOUS

PDF

37.1 KB Created: 2020-08-10 02:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38e3f0f83e311a2bf6c6e30059605161 SHA-1: 01ad9927a2d9bfce2647c8685539576e2f046189 SHA-256: eca405b81dee55ef09308eece5ee3dcae1ab4a6b77ce65ca973ed7df495f673d
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. Another heuristic detected a link farm of 28 PDF files hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive use of external links indicates a likely phishing or content distribution attack.

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.com/pify?keyword=imperative+in+english+exercises+pdf
    • http://files.colquittcountysaddleclub.org/uploads/1/3/1/4/131453436/4a8e2.pdf
    • http://files.flyingmissionusa.org/uploads/1/3/1/3/131382841/vafemazonega-romedasukuf-febalowurowujo.pdf
    • http://zotugelir.sgbc.org.ng/uploads/1/3/1/4/131454106/9616a236.pdf
    • http://files.louisemarkus.com/uploads/1/3/1/8/131857679/0cb7914f296.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/finivuzasukasunomepamuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/46700010159.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/90948413227.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/fijolukogazejojavogabuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/lidugavunado.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3270/files/cellula_eucariote_e_procariote.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/jinazofararazixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3241/1298/files/30561588320.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/zufudifogofonigenotuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/21418381634.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000462b.bin
9f6582e2c05b481535741d4eb62f7c55f7731ffb305e3aba0a9a4d41fa472e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x462B 5312 bytes
font_01_sfnt_off00005808.bin
99075f3e672a00f57d3d4ed8ee7b264c8ac1f2983dd034569035a6245773cb3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5808 9712 bytes
font_02_sfnt_off0000793d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 4324 bytes

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