Malicious PDF — malware analysis report

Static analysis result for SHA-256 0968cb779c94c0ad…

MALICIOUS

PDF

40.5 KB Created: 2020-08-07 08:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da02ef5762f322b3dcf387c79062377b SHA-1: 74038c26398d04afeae60bcdc28eac97ad60ad33 SHA-256: 0968cb779c94c0ad63b6591d05b90af8c8b44e2a459d14a100ea03d25682857d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the target URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=auditoria+financeira+teoria+pr%25C3%25A1tica+pdf
    • http://gipamata.brendagratton.com/uploads/1/3/2/6/132681670/924688.pdf
    • http://files.aliceannephotography.com/uploads/1/3/1/4/131407572/8075709.pdf
    • http://files.harrowphotographer.co.uk/uploads/1/3/0/9/130969999/7542480.pdf
    • http://files.ourfamilyunion.com/uploads/1/3/1/0/131071137/074e1.pdf
    • http://files.oregonlumberworks.com/uploads/1/3/0/9/130969553/2143591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/sidolifitajixunezevopur.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/48891044250.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/59802834033.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/fuvotej.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/biohacking_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/milusetujozetedevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/85664876489.pdf
    • https://cdn.shopify.com/s/files/1/0432/1814/1347/files/58543304731.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/batufemivajug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/prince_edward_island_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuketunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2639/8888/files/150608767.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/73251547492.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_off000051ee.bin
e781b2139c4ae97ded9d1e4125eb705e81c14c24e6c8b60f67525574de3652c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EE 5160 bytes
font_01_sfnt_off00006304.bin
d2f7198a530c7d7bcd54c594379f2a06470af8b61fc4e74d53bc8d6e2ce4c5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 15848 bytes

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