Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb195409b50163d7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 18:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b5a3185ead0fb4753eedbfc5fd608b SHA-1: e784cd8cf22241c52a9123dce5a4eab78f496f89 SHA-256: bb195409b50163d7fdb86fb0f8a96a54145ccfbec1684945b6cf0a190c97bba0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.com/pify?keyword=conjunction+words+pdf+download', suggesting a lure to download further malicious content. The ML classifier strongly supports the malicious verdict.

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=conjunction+words+pdf+download
    • http://menonugas.gregoiremazars-folio.com/uploads/1/3/1/1/131163635/d7289ecefc.pdf
    • http://files.playpokeronlineinindia.greatwebsitebuilder.com/uploads/1/3/1/0/131071167/nonaxojo-wefafutomidimi-laguvegewure-ferijer.pdf
    • http://files.kellyharkinsdesigns.com/uploads/1/3/1/8/131856039/tanifatexoziwo_kowaxososenezi_napelibapuda.pdf
    • http://files.hillsontheroad.com/uploads/1/3/0/7/130738852/9974146.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/53186101412.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7288/files/6758509948.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/83309410712.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/8845/3533/files/43858246735.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/83407359858.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/30332292884.pdf
    • https://cdn.shopify.com/s/files/1/0432/7017/6932/files/freebsd_vs_openbsd.pdf
    • https://cdn.shopify.com/s/files/1/0430/8179/3698/files/mazixadisedov.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/kasusiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069aa.bin
f3dd7952a8a2f59efab978391b57dd1a9fbb1d3e26196f5ef34216992e2a3ca2
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AA 5220 bytes
font_01_sfnt_off00007b8e.bin
a8dbed7cbbcdcb9a867f4550eace37c4374b8b47d9dc4d445eb140a4e0acfc44
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8E 10180 bytes