Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1866fb9a6c157d4…

MALICIOUS

PDF

48.7 KB Created: 2020-07-31 04:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5bb9a11f7d30ed0b7acad6a346d437d SHA-1: 1da7f0d4e57b0d1a6189b2cc8f3f5a5f2b572843 SHA-256: d1866fb9a6c157d4f404c89db52aea2487827d3a64d42d8c8b63ea0cc1b8d806
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains numerous links to external PDF files, many hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=the+ethnography+of+communication+an+introduction+pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially to mask malicious links.

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.ru/pify?keyword=the+ethnography+of+communication+an+introduction+pdf
    • http://files.michelamclaurin.com/uploads/1/3/2/3/132302907/8070907.pdf
    • http://files.yoshiokachihiro.com/uploads/1/3/1/4/131437376/1435116.pdf
    • http://files.emwfusion.com/uploads/1/3/2/6/132680860/9e2d825b14.pdf
    • http://files.lisamccafferty.com/uploads/1/3/1/3/131383664/bamibitamurata.pdf
    • http://files.magicalcelebrationsutah.com/uploads/1/3/1/1/131164067/gaxikufinepaza.pdf
    • http://files.magicalcelebrationsutah
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/giribezivobuvozutuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/fuwobituzowaluxen.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/48125527738.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/83295521300.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/55174946407.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/gezaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/5818/2809/files/kepadejodij.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/jirezepizowipupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/73537480869.pdf
    • https://cdn.shopify.com/s/files/1/0441/3269/6216/files/16662699560.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/21854306253.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ff9.bin
79ec35a2d611d1f3c7e6d4411445a4111a787834b721bdf106b372c477cdf27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 5292 bytes
font_01_sfnt_off000091d1.bin
f1f1338e830234501fb051c7a4d290e0080c8130b6ad8b521f6e9344bb27aae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D1 10356 bytes

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