Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b6e94275d26601…

MALICIOUS

PDF

45.3 KB Created: 2020-09-28 17:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b641b0b45e953c1275422b5892191013 SHA-1: 2661b636b5d41aad4acf3e6947424e768fc7841f SHA-256: 78b6e94275d26601b8a8c1a7ddd8b83b45052a7da1556910373570638d517dab
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. One URL is explicitly identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to direct users to potentially harmful content, possibly for SEO manipulation or phishing.

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/mozel?keyword=bharatanatyam+adavus+pdf
    • http://files.willowbowmassage.com/uploads/1/3/0/8/130813757/nutakowino.pdf
    • http://xapip.johncobbphotography.com/uploads/1/3/2/6/132695471/3496545.pdf
    • http://files.breedingforthefuture.com/uploads/1/3/2/6/132681566/sutavumuz.pdf
    • http://doziwo.maddiehulsman.com/uploads/1/3/1/4/131437089/97ed53df.pdf
    • http://kaferok.annetrauben.com/uploads/1/3/0/7/130739956/zifer.pdf
    • http://files.peacetotheplanet.org/uploads/1/3/2/6/132683328/viwatudiremuj.pdf
    • http://files.childproofingcolorado.com/uploads/1/3/2/6/132682989/440909dd0fea.pdf
    • http://karazuf.phyllis-kirk.com/uploads/1/3/0/8/130874002/2abe23f123f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/pamifajurutejapuxejoxapad.pdf
    • https://cdn.shopify.com/s/files/1/0479/1425/4502/files/29592255402.pdf
    • https://cdn.shopify.com/s/files/1/0440/4379/6645/files/contrato_de_consignacion_word.pdf
    • https://cdn.shopify.com/s/files/1/0435/5165/4047/files/mekosapiw.pdf
    • https://6edba398-d2ff-4919-b99c-14319d9ea2be.filesusr.com/ugd/c722c2_96df3ed7ae90405f8570a4b45368c93b.pdf?index=true
    • https://f937427b-c6b8-41ac-9d03-7f8267ba20a5.filesusr.com/ugd/d1d005_3f5b71952534464fb086ce4aec4b42a4.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa4.bin
325f176b270e47351ab9586e6d8c643673b90bd16a900fb206345d98c0016f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA4 5460 bytes
font_01_sfnt_off0000721d.bin
71a88f48d6a6b49b090b2814aab841b17cbf329f55dd1b199e5bbd4ab6e07ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 10584 bytes
font_02_sfnt_off00009578.bin
d17f3b21950f6e9da176acd54a1e880fb41f875d94f49a18c9866dfc6bc2243a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9578 5288 bytes

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