Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e556949607d1caa…

MALICIOUS

PDF

45.6 KB Created: 2020-07-23 12:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2649fc83002f715495fa50f82ca04afb SHA-1: 1be977d0b9883b2e7cb232686c5b5449e8a390ce SHA-256: 8e556949607d1caa23da756ff8fa6048868de04750f9bc755b2e6b3557af4a88
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern appears to be directing users to malicious infrastructure.

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/wb?keyword=types%20of%20computer%20virus%20and%20definition%20each%20type%20pdf
    • http://files.williamtmohn.com/uploads/1/3/2/6/132681993/pojoxokikival-datomopeluba.pdf
    • http://files.metalmeltdown.com/uploads/1/3/0/7/130775755/36f932b68a.pdf
    • http://files.detailersdirect.co.uk/uploads/1/3/2/6/132682042/7851778.pdf
    • http://files.thermotrix.com/uploads/1/3/1/4/131407734/12612e9.pdf
    • http://files.3moons.org/uploads/1/3/1/4/131484728/6275560.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/muvujuvanizujemix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/879523348.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/magux.pdf
    • https://cdn.shopify.com/s/files/1/0432/5277/7128/files/bulapakugek.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/85179021412.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/gebodozidilesupudepoxe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/67334620362.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/migupegojutitijakesagodog.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/68000462639.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5719/files/begubeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/75983320438.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/24036928014.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/soxezejajavisar.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_off000073f8.bin
e03e978d43aac6ebca29a01e9180ad3791da0c7a6ccfc4e5522db3444b8edea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F8 5356 bytes
font_01_sfnt_off00008609.bin
4b8c52b2de2cf1b1fb28135ede94da398de2fd4c0e582ccc3a6aa3a985f2de28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8609 10236 bytes

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