Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd56fea70d9d12d6…

MALICIOUS

PDF

39.2 KB Created: 2020-08-30 09:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fd782406ee0e12fa0ea52350284d2a9 SHA-1: c1f37eadf71a52177606d49d3f420f7a336bdca8 SHA-256: fd56fea70d9d12d6c97107f69354f4ac805e88b46c7b027722806f70986ece61
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted, and the document body was heavily obfuscated.

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/wix?keyword=avh-x4600bt+wiring+harness
    • https://static.usrfiles.com/ugd/b8c837_5097ae9a06ab421aaeccb800d9fed630.pdf
    • https://static.usrfiles.com/ugd/bd5c68_ad784015086b4b36a0d7122ce02e499c.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_3c0fdd29cc054e46b8eb618c150e330b.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_51667dfdb0f2408c99f5496248e38dfd.pdf
    • https://cdn.shopify.com/s/files/1/0437/7542/6722/files/57767848423.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/82416779725.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/gta_v_stunt_jump_locations.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/68867655931.pdf
    • https://cdn.shopify.com/s/files/1/0435/7488/6563/files/std_on_dicks.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/argentometric_method.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2646/files/kelinopixir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0463/0370/7298/files/12607283486.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_off00005062.bin
2c06cdab064673a422148091bfcc4e7b12f30222275be750a5207755fe410ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5062 5680 bytes
font_01_sfnt_off000063d3.bin
d021e8ec962d09077a36f5d16406fa28ec9c1787d4456ef29bdb15f4e2653c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 14384 bytes