Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f0f7877240dfed…

MALICIOUS

PDF

34.5 KB Created: 2020-08-18 23:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab972ce2d73e8bdc3db298d27ca93126 SHA-1: b55186f06429e18fc8630e249d0b7b43228ba217 SHA-256: a7f0f7877240dfedf30c5a58f4adab195a72ffeb3e6703b73fe7fc3ffed5c64f
150 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a 'sc1 self certification sickness form printable'. This link, https://ttraff.com/pify?keyword=sc1+self+certification+sickness+form+printable, is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to various PDF files, likely to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=sc1+self+certification+sickness+form+printable
    • http://files.antiquityranchboergoats.net/uploads/1/3/2/7/132740545/9241925.pdf
    • http://files.kaylaraesphotography.com/uploads/1/3/0/7/130740127/nifojilelusupebedu.pdf
    • http://files.limadrivesdachurch.org/uploads/1/3/1/0/131070501/1610080.pdf
    • http://fovun.leaveittomama.com/uploads/1/3/1/4/131407406/suwugimipibenevezez.pdf
    • http://files.led21hd.com/uploads/1/3/1/4/131407952/pesojikisufuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/57457068835.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/kodekupinenis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/92142268610.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/lynnfield_ma_zip_codes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/61984925057.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/zasodaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3821/files/abcde_del_melanoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/5341/5576/files/alteraciones_cognitivas.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_off00004844.bin
8d1acb29fd81aa50957d06dee73c7dd5c23d2004ee91deebba62094ec2c20746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4844 5520 bytes
font_01_sfnt_off00005aec.bin
03895f395574b3da55fdeb5a55ed485c3464d5e1f438a9a8cc29f795733d7519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEC 10040 bytes

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