Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2d04a451520ae3…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 10:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cfe37934e7a8ca47b1eb0ef752a9151 SHA-1: 2f817c5059b3949fb9189fedd8b95028ac6043f3 SHA-256: 7a2d04a451520ae31dbf39ff0433548b12fc7682f9cd3d092ff38cb5851cdfda
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a serial key for AVG Internet Security. This link, 'https://ttraff.com/pify?keyword=avg+internet+security+2017+serial+key', is identified as a malicious redirector. The document also features a large number of embedded links, many pointing to Shopify domains, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious verdict.

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=avg+internet+security+2017+serial+key
    • http://selenujam.asafcircus.com/uploads/1/3/1/4/131438019/bafifig.pdf
    • http://files.millcreekscattledogs.com/uploads/1/3/1/8/131856176/9742416.pdf
    • http://files.pureblissbodyconfections.com/uploads/1/3/1/1/131164456/c6aa84833.pdf
    • http://mewigig.bandito.agency/uploads/1/3/1/4/131453645/tukasinofate.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/electromagnetic_gauge_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/riwuwugapulimawu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4512/1182/files/expressions_equations_and_inequalities.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/sopizus.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/bipad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/rubebototazud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/17788784253.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1602/files/tifopufajabivare.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/91535207982.pdf
    • https://cdn.shopify.com/s/files/1/0452/8193/5522/files/3931608829.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/tuzazejowut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/59562289837.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/19420422680.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/guxunamovipofona.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/kapoxaridubisakit.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_off00006692.bin
62498ac872b4df9b7f2487d2917dd4406d33bd1519af96dda91f0f2a6c09c55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6692 5588 bytes
font_01_sfnt_off000079c4.bin
aed640715854b249cb0c76d6243c92973a82fd8c29af293cc03334dc53f5716f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C4 10640 bytes

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