Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9e9f64c8cc4a86…

MALICIOUS

PDF

40.3 KB Created: 2020-08-09 21:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaf57c30e6febafd61778012e437c683 SHA-1: 2e2e7aa0077c5d925627a86df15978b1f4c5586f SHA-256: 6a9e9f64c8cc4a86ebad362634d69500aebe04a524d38b44e6a9d56710989f2d
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://ttraff.com/pify?keyword=bss+in+telecom+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful 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=bss+in+telecom+pdf
    • http://files.cidangelcarpetcleaning.com/uploads/1/3/2/7/132740399/filidavosatujok.pdf
    • http://files.radonchamber.com/uploads/1/3/1/3/131398507/lopoworog.pdf
    • http://files.bonairetaxi.net/uploads/1/3/1/3/131398006/mitipuvogegu-xuxijeborelalek-molitidu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/50248808522.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/dipepesikowixodebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6952/1568/files/favejaratematutad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/todazidazipuzax.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8165/files/problemas_psicologicos_en_el_adulto_mayor.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/44974621943.pdf
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/57547267792.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/dosebobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/54982143546.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/8871413193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizazuvolabemonixodokij.pdf
    • https://cdn.shopify.com/s/files/1/0438/9444/0104/files/accounting_cycle_exercises_with_answers.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_off00005fd3.bin
124ad6b5b8e761177f7682b58d3f0640c8c3784fdcce53fb5c51531ac9f18af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD3 5044 bytes
font_01_sfnt_off000070f5.bin
c3e9c70fbbe034606a6b8f361831d97304c77ea5ab213108b98b5df65a4cde28
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 10508 bytes