Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d94a89c6aa6357…

MALICIOUS

PDF

66.6 KB Created: 2020-08-25 19:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187f0e1a7eb1f8bf10552d568540c0ff SHA-1: 128aafe44ed06f4094af574bdf52663a57c61c8f SHA-256: 91d94a89c6aa6357868334d1f0437347f9b3121cc7b4f419eeee54dcf2c26d4b
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link leading to a known malicious redirector. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=usda+cold+summer+download+zip', suggesting a lure for a fake download. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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=usda+cold+summer+download+zip
    • http://zuxumomup.diplomainprofessionalstudies.com/uploads/1/3/2/6/132680981/zoleve.pdf
    • http://files.connectpreschool.com.au/uploads/1/3/2/6/132680808/f7d61.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/nurum.pdf
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/carson_dellosa_math.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/70864900596.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/25068896122.pdf
    • https://cdn.shopify.com/s/files/1/0434/0803/1893/files/chloroform_spirit_solubility.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/pojurowakabiraxasovejev.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2840/files/workout_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/womabiritiretupipopabujak.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_off0000b806.bin
a804a36fa12829293419f621d276097b4e68112548301c238be175f285b64b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 5352 bytes
font_01_sfnt_off0000ca39.bin
8c7d6e67589ace79e35c046d4b24ce72e6053580166d16c503304c05de67e7f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 16788 bytes

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