Malicious PDF — malware analysis report

Static analysis result for SHA-256 921d82d7ef2c9d25…

MALICIOUS

PDF

63.0 KB Created: 2020-08-28 05:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2271b56cb89ed53ca4eb7b49bed75ed4 SHA-1: 2daced0205f55ab4a3454c125db54320a3cc4bc1 SHA-256: 921d82d7ef2c9d250b6153ce76efd15b96a5a0766e32d6ca8fa3364624bf5751
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'The ultimate guide to job interview' and the malicious URL, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger link farm, likely for SEO manipulation or to distribute malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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=the+ultimate+guide+to+job+interview
    • http://pipit.claudiaeisenmurphy.com/uploads/1/3/2/6/132696414/fujodolegan.pdf
    • http://files.dldtassociates.com/uploads/1/3/1/4/131453944/gezanadaz_rolomaxi_kumejuriweturo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/64322197310.pdf
    • https://cdn.shopify.com/s/files/1/0440/7659/7400/files/riwimepuzuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/28277607955.pdf
    • https://cdn.shopify.com/s/files/1/0457/4599/5932/files/bojoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/56282935768.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/pivosojejesaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/danixaxinazizowunome.pdf
    • https://cdn.shopify.com/s/files/1/0449/2853/2635/files/nike_brand_positioning.pdf
    • https://cdn.shopify.com/s/files/1/0463/0796/7141/files/jinuzizakeribunaremonar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab24.bin
28446ba071c44fc2177721d543d35d1f8771200dfd2e9e209c695fd3853aa31c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB24 5260 bytes
font_01_sfnt_off0000bce9.bin
1810b0b5d02345bfc814d6a691fa9c019d0fe15ddfdd3f3c898b1ca4c4dad074
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 10536 bytes
font_02_sfnt_off0000e0e4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 4324 bytes