Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf0218d03aa8248…

MALICIOUS

PDF

69.2 KB Created: 2020-08-10 17:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0138a913988335538aa4871507d22e13 SHA-1: 3367b765fa67581826302b2af588fb66ddf89c8a SHA-256: 6bf0218d03aa82481da1285f912d098f90aa56bbf486bd67951fd41ab43d99bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous links, many of which are benign Shopify URLs but one critical redirector. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=buckling+of+columns+pdf', is the primary indicator of malicious intent, likely serving as a lure for further compromise.

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.cc/pify?keyword=buckling+of+columns+pdf
    • http://files.kw.ehabacademy.com/uploads/1/3/2/7/132741535/7412732.pdf
    • http://files.pillowellsilverband.com/uploads/1/3/0/8/130813134/2670026.pdf
    • http://files.smrtartdepartment.org/uploads/1/3/1/3/131384777/1202d6cc5ffafc.pdf
    • http://files.gcspatriots.org/uploads/1/3/0/7/130776099/e79ae.pdf
    • http://tuduni.sparkycarpetcleaning.com/uploads/1/3/1/4/131407155/2364809.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/leap_year_dates.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/meteli.pdf
    • https://cdn.shopify.com/s/files/1/0436/0952/2339/files/megituwifetatefa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1862/files/puxemilenivimogepozujiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/76331732078.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/30982012339.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/xijoposide.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/kojawomibipexotewevovow.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/effect_of_air_pollution_on_respiratory_system.pdf
    • https://cdn.shopify.com/s/files/1/0439/2163/7544/files/pepififulon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/21655312168.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/34567050384.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/39430300767.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b28c.bin
5b6c66d16732754cd263906cdcd1bf5e26f8d4f77830c0051dbf76c8a0e36bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 5280 bytes
font_01_sfnt_off0000c47c.bin
cb7d6a76417d3c1764571a8f3b07979127a48d575ba89a729a0815fe6521ca76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 14444 bytes
font_02_sfnt_off0000f2b2.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16036 bytes

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