Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3ac0bc7429e38…

MALICIOUS

PDF

41.6 KB Created: 2020-08-15 07:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4eb069916a7bc1d49e9eae9d66c803 SHA-1: b67a3a7a0832ff3f050c440d48a6bf76ad834c41 SHA-256: f1c3ac0bc7429e387147016c05fa5039f385ea5b4f271eb1bed91b70e76bab0b
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. One of the primary links, 'https://ttraff.ru/pify?keyword=birkenhead+sixth+form+college+term+dates', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the primary malicious URL.

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=birkenhead+sixth+form+college+term+dates
    • http://pijotule.emsot.co.uk/uploads/1/3/0/9/130969162/fadoxagek.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/marketing_process_steps.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/wepabuvazujebopufopexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/39752047211.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/33293469586.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/daxaxajom.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/discord_webhook_embed.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/6728750471.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/kijebigalupatexarop.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/xenuwadusizetez.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/waxoliwoduzosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/27780910023.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_off00006379.bin
f9f99781c3b971e07616853f14eac0156e3d3518c2a245d908218249e952a707
pdf-font-stream PDF embedded font (sfnt) at offset 0x6379 5616 bytes
font_01_sfnt_off0000766a.bin
e9f4c869a5eaeaf1431c7528ddb936b2e5f5cf0498c065c023057f091dffda15
pdf-font-stream PDF embedded font (sfnt) at offset 0x766A 10368 bytes