Malicious PDF — malware analysis report

Static analysis result for SHA-256 3413a46413822d05…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 13:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63dbcee9e72eb89acb0dac56530bbad SHA-1: f52c12ebca5ec7b9a0202256a1adad2da660db41 SHA-256: 3413a46413822d05663e6a9124e57710d43ceef6d88e4af981545163b15fc500
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to external resources, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=cysteamine+melasma+pdf'. The document also contains a heuristic indicating it might be a lure for a password-protected archive, often used to bypass security gateways. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.cc/pify?keyword=cysteamine+melasma+pdf
    • http://files.michaelquesnel.com/uploads/1/3/1/1/131164573/zatiroranik.pdf
    • http://mokovod.lifebydesignpa.com/uploads/1/3/0/7/130776791/e528daf3cb1.pdf
    • http://mupafen.tearneylab.org/uploads/1/3/1/6/131606289/zowuvuvomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/maharashtra_housing_society_bye_laws_2020.pdf
    • https://cdn.shopify.com/s/files/1/0448/4897/1938/files/bgp_cisco_press.pdf
    • https://cdn.shopify.com/s/files/1/0435/2684/8661/files/anthony_bourdain_typhoid_mary.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/bemuroxaxumovavewat.pdf
    • https://cdn.shopify.com/s/files/1/0436/9537/4489/files/wanderungen_appenzell.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/44578223954.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/dapetemedumuwupifawo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9984/6824/files/david_gray_sail_away.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/redok.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c3.bin
ef6483657842cf640acc8b46210e35d4269f543dedd74e1a222767f3eff5d935		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 5096 bytes
font_01_sfnt_off0000740f.bin
964efd334025c73ab6d3aeac31f373075da55aa2b0d738d1852ef4d33fae1f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740F 10524 bytes

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