Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d007b9f0b482e70…

MALICIOUS

PDF

34.1 KB Created: 2020-08-07 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c09325bee68c814d7c6ed825fb02e9f1 SHA-1: f05c5ea5157a91e8ee1c74724df9a31f843ac757 SHA-256: 7d007b9f0b482e707066c9525b2052397c16282d5674f7a841fbf624a5e3db06
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a guitar tab PDF, which is likely a lure. The presence of multiple external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content.

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.com/pify?keyword=asturias+tab+guitar+pdf
    • http://files.alaskazooarch.org/uploads/1/3/1/3/131378918/ganopefagobaku_gosime_gufogepunekenun.pdf
    • http://files.thewelltraveledteacher.com/uploads/1/3/1/3/131381048/tuxij.pdf
    • http://files.johnstephenbritten.com/uploads/1/3/1/3/131398308/b7754001a82a19c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/pdf_babylon_mystery_religion.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/6332887348.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/dajiwipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/deribawolulolerotevupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/67870748890.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/36682861598.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/dalutubowumetogesov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/49293820606.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/77581107468.pdf
    • https://cdn.shopify.com/s/files/1/0436/3229/6089/files/3rd_grade_go_math_workbook.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_off000047b5.bin
51c95854e6ec60b4a5d33ec97dbe23e6c0e27f31ca30c673f767b7c1c6afd175
pdf-font-stream PDF embedded font (sfnt) at offset 0x47B5 5308 bytes
font_01_sfnt_off000059cc.bin
c192ab15916e14ed2be31575974a0f5e5ca2b402e646d2eac4e55b4de9d21e05
pdf-font-stream PDF embedded font (sfnt) at offset 0x59CC 9924 bytes