Malicious PDF — malware analysis report

Static analysis result for SHA-256 71166b34d1af1c6b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-22 08:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ecc9330fe02faa82d180fedd075411d SHA-1: cd1a43bde3d985036ab679ea273656f55a3e1082 SHA-256: 71166b34d1af1c6b1fe47e297b7a9f6aaa28346d1b21fdc92866b4494054b453
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to an eviction notice, aligning with the 'SE_INVOICE_LURE' heuristic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=30+day+eviction+notice+template+wisconsin
    • http://jabef.pcaspiritstore.com/uploads/1/3/1/4/131437462/628ae2890247503.pdf
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdf
    • http://files.thedenabilene.com/uploads/1/3/1/3/131384468/zogerotopikepin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3560/5664/files/kusigopabifun.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/62112798033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdf
    • https://cdn.shopify.com/s/files/1/0431/3359/9893/files/bd_laws_gov_part.pdf
    • https://cdn.shopify.com/s/files/1/0439/1275/7400/files/93799355955.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/4680849024.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/18710290444.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0447/1940/7257/files/ipod_classic_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/mabederokokamevodaguwev.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006565.bin
f5b19cafe01b4ce52bef430be443a6f0b75d96050710fb27b62d1e40bc5d0b36
pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 5588 bytes
font_01_sfnt_off0000786d.bin
9f47facc0e88f0e0c950a31afed92371ce752ef9cb0b56ed6f78ae1e693d9d96
pdf-font-stream PDF embedded font (sfnt) at offset 0x786D 9936 bytes