Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5829ff577fdef43…

MALICIOUS

PDF

45.9 KB Created: 2020-08-06 02:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f4a439c17c28f79efb76b2aba0d592 SHA-1: 1c69b98984c38fb6a0de5f25239f5eb8f21b5f13 SHA-256: a5829ff577fdef43bb8518564b4a4588c276dce35991b19c6017ef4fc4cf2d91
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `ttraff.ru`. This suggests a link farm or SEO poisoning technique used to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious redirector URL is the primary indicator of compromise.

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=applications+of+gis+in+agriculture+pdf
    • http://files.moamsticks.com/uploads/1/3/1/4/131453555/6b5d1b66cbc9ff.pdf
    • http://files.classofwestk.org/uploads/1/3/0/8/130814397/4323861.pdf
    • http://tebuf.simplyyounutrition.com/uploads/1/3/0/7/130776407/9507057.pdf
    • http://files.rebeccadentonphd.com/uploads/1/3/1/6/131606134/tigiw-fanaf-zerelodevunu-wofititewarolul.pdf
    • http://files.pcdeca.com/uploads/1/3/0/9/130969061/kovoxorutegow-luwemanituvilut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/popidomapotaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/76916256700.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40814320730.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/lil_snupe_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/47602249479.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/nebakodiwudosolopobib.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/lobopum.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/pedorukejoxikeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/86132101214.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/zixiniveniveja.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/vazimizuzulorem.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_off000074eb.bin
9a0ad337ccce24ef111ff599f97fcab758dd507a1e5d4c463641743ca316bf33
pdf-font-stream PDF embedded font (sfnt) at offset 0x74EB 5312 bytes
font_01_sfnt_off0000870d.bin
f84f6fe18d92594d4986408230c11e62ac72d3ba8685623647905a9d026672dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x870D 10352 bytes