Malicious PDF — malware analysis report

Static analysis result for SHA-256 e399a7666ff2b7c4…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 15:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20caa6fcca7ba86446b2a7caa939b730 SHA-1: a7c85252cbdf7984b30aae73fecf0cfe0cd75ed2 SHA-256: e399a7666ff2b7c42d82e241666c8903c7e8ea66b263f8353e3794805da7a742
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One such link, 'https://ttraff.ru/pify?keyword=fool+for+your+loving+tab+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports the malicious intent. No scripts were extracted, but 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.ru/pify?keyword=fool+for+your+loving+tab+pdf
    • http://files.katherinemgjones.com/uploads/1/3/2/7/132712383/nobomedijevato_fajexobodelaga.pdf
    • http://zowawe.saintisidoresalpacas.com/uploads/1/3/0/7/130739415/bd7df864ddd9a38.pdf
    • http://files.raymondbassmasters.com/uploads/1/3/1/0/131070689/vamekata_lugezese_kidojoxepoxoza_masavom.pdf
    • http://files.kranefeldpicturesink.com/uploads/1/3/1/1/131163969/kamimebopikakeko.pdf
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/33052192505.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/29122387975.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/davolawuza.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/24743925601.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/70458804240.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/86997535784.pdf
    • https://cdn.shopify.com/s/files/1/0438/1219/2413/files/nirugakoxadexofaniro.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/52127259853.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/wasugup.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/46632030586.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8117/files/79624118337.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/jidumomisaleni.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_off00005726.bin
cabe13745d3af6bf8e95c5a2f77d19fd52ea4dd75b6c452af88815cbddc9521a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5726 5288 bytes
font_01_sfnt_off00006940.bin
81c6567e10157b0b760ce752dae1474b1d95ebd86612807a4a4b8c948f5607f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6940 14340 bytes

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