Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40b0274e29407be…

MALICIOUS

PDF

34.2 KB Created: 2020-08-20 00:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df7dd4bb483615b14f93ae67b8ed365d SHA-1: 22b55a644b0c8c9a7a5c421b841f5c70c36ffcb8 SHA-256: f40b0274e29407befb985e4f605e19e00cdde9ffbc66062fc1d867e8834bc618
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 of which point to a link farm hosted on ttraff.ru. This infrastructure is known for redirecting users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern is the distribution of malicious links within the document.

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=features+of+a+non+chronological+report+activity
    • http://files.jemun.net/uploads/1/3/1/4/131437538/zimef-pafitakimu-kazuwapofi-xefulogekasa.pdf
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdf
    • http://files.mariedilorenzo.com/uploads/1/3/0/7/130776775/17f41ba.pdf
    • http://files.kennyfedorko.com/uploads/1/3/1/0/131071043/9219402.pdf
    • http://xubaros.louiseharnbyproofreader.com/uploads/1/3/1/3/131383790/sepat_kimewij.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/organized_crime_lyman.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/xolazupuserijuwegejuruloj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/tomomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/refrigeration_and_air_conditioning_handwritten_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/xatame.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/javascript_remove_spaces.pdf
    • https://cdn.shopify.com/s/files/1/0447/7173/7749/files/important_questions_for_class_12_biology_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/10939474226.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/98823226439.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/lipetelixotige.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_off0000484d.bin
907fd74d1f46867cf1107edb6e77f718028f86560de0ddd0fcc8af115eb98249
pdf-font-stream PDF embedded font (sfnt) at offset 0x484D 5392 bytes
font_01_sfnt_off00005ab7.bin
45ee11167fce247067aa1ac181efe7059aabf98bcaf1ad5bfdd09b89f86c9353
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB7 9720 bytes