Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c0089d265212f7…

MALICIOUS

PDF

45.0 KB Created: 2020-08-22 20:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb8ccc8291d0bd600cb96b1c8c6b5999 SHA-1: 315b9827f8843c41e2c2b3e9b0a44e6f9192c5ad SHA-256: a5c0089d265212f79fc5b0d11c0aa4dccd688666885cf89274dc283e172ab433
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites via these links. The document body contains garbled text and a URL that appears to be part of the link farm.

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=bk+murli+songs
    • http://sedudos.marydanroth.com/uploads/1/3/1/4/131407241/2ec2564c5d78a.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/duxavaduwusigusovumavudog.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/98117159982.pdf
    • https://cdn.shopify.com/s/files/1/0429/3709/0211/files/dolokinazubewutig.pdf
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/40017034008.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/dabuxoridobaromedodam.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/vuzobazisuzunixudexiwen.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/86448887611.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/tamaromif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/alkanes_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/34362555609.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/
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/dabuxoridobaromedodam.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007425.bin
c6ffdf8b16ca4f7df9461d363e7b4e48c07f588341585c418214a8c5fea5432e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7425 4908 bytes
font_01_sfnt_off000084c7.bin
b923da62738c2bbd94f800d737f724c7a7a40ee5d483fbca0cf3d756c49c7dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 10228 bytes