Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ac0a6359c7ac61…

MALICIOUS

PDF

44.6 KB Created: 2020-08-12 00:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1081cebe4e87302b0f0366126e84feee SHA-1: c1683d737eb8125683bd3c1454665525a582004b SHA-256: 73ac0a6359c7ac61e07b1097aa2b2684b26781695e92aea8464fe932e93a36fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'voucher type creation in tally erp 9 pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of many external links, including benign ones on Shopify, indicates a link farm strategy to obscure the malicious destination.

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=voucher+type+creation+in+tally+erp+9+pdf
    • http://files.modularsinc.com/uploads/1/3/0/7/130739480/kapavubibirojudegit.pdf
    • http://files.markwilsonmusic.net/uploads/1/3/1/8/131856827/3742472.pdf
    • http://mazim.raynecreative.org/uploads/1/3/1/4/131407089/4271120.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/78411463171.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/56812368423.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/17933142406.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6467/files/pedorenorajoxatuletek.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/kent_county_jail_inmate_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0437/3967/6821/files/dexenivuvezikofikiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/79804353400.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/boketuwebivasifadojezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/xitatutozowobujimeguxup.pdf
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/92701471609.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_off00006faa.bin
86e58074733bc1458c6b45106dc4c6b1f98fdad1560174d1722a15c1831e95fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAA 5288 bytes
font_01_sfnt_off000081ab.bin
094fd6aa12efdceeacbff2f7650c99e516a60cff57175a98f75ac2ceb22cdeb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 10564 bytes