Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0f8d51f9ee8caa…

MALICIOUS

PDF

38.5 KB Created: 2020-08-24 08:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4276490d440ebf051d4480e8b84bdfa SHA-1: 8125d4019b08e5df8c1bbbd6130342d372722732 SHA-256: 0d0f8d51f9ee8caa62b7828ee07abc532fbd8e9272b1468cbfbe6d494ab45d8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=avma+guidelines+euthanasia'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several Shopify URLs.

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=avma+guidelines+euthanasia
    • http://files.christaniehunterart.com/uploads/1/3/0/7/130739081/1138638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8625/6030/files/mizabejekenimafosese.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/besetonebovojolamuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/55266388319.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6872/files/2192922788.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/90073055951.pdf
    • https://cdn.shopify.com/s/files/1/0438/1048/8477/files/assistant_property_manager_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1185/files/kobuxemolubavofixep.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/vaxonalulojureme.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/nudamevowilolozoreniwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7395/files/44405503453.pdf
    • https://cdn.shopify.com/s/files/1/0437/0009/3083/files/wofiwatafekuwarevok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5732/2903/files/maple_hunter_decals.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_off000057db.bin
976b20cdfbd736aad781a9e70fd021cd5809c8c0b257d33a33ac5e19407d7fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DB 5192 bytes
font_01_sfnt_off0000695e.bin
5894c4c13146f99fd5b4169299f607e8febb52e5f5936b52793df14c89cdcce9
pdf-font-stream PDF embedded font (sfnt) at offset 0x695E 10700 bytes