Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f1bfac28d6cffa…

MALICIOUS

PDF

44.2 KB Created: 2020-07-20 00:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252d8730a9746a5ea465e5ddde03a1a8 SHA-1: 87ae365ba06fc5a36c29e176dd6a16d753c8948c SHA-256: b2f1bfac28d6cffab97e9182b223c16960c563b344a8d704c96410af09d5aaa3
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain metadata related to 'Sdg goals chart pdf' and 'wkhtmltopdf', suggesting a lure document. The presence of multiple external PDF links, many hosted on WordPress, indicates a link farm strategy 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.ru/pify?keyword=sdg+goals+chart+pdf
    • http://files.hikinggrenouille.com/uploads/1/3/0/8/130814666/malukudaraka_foxadisodutupe.pdf
    • http://files.lakelafco.org/uploads/1/3/0/9/130969710/6383655.pdf
    • http://files.wallstreetwhizz.com/uploads/1/3/1/4/131453214/efed779e23.pdf
    • https://karutetok765055257.files.wordpress.com/2020/07/80533671923.pdf
    • https://xofegobofam976630145.files.wordpress.com/2020/07/61947083842.pdf
    • https://xukojiruxe.files.wordpress.com/2020/07/rarakapiraferujagavib.pdf
    • https://vusuletameta.files.wordpress.com/2020/06/10744524603.pdf
    • https://xowutima.files.wordpress.com/2020/07/zarezupug.pdf
    • https://murodebedani.files.wordpress.com/2020/07/menatuberewelivusodikepa.pdf
    • https://sexepik.files.wordpress.com/2020/07/kexuw.pdf
    • https://gamumibas.files.wordpress.com/2020/06/57429275480.pdf
    • https://ritibifido.files.wordpress.com/2020/06/38428757588.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/4897260053.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/nisex.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/vukomukipiramagazufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/dotazojofofupatanu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/guwabinegejoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/5632193592.pdf
    • https://cdn.shopify.com/s/files/1/0432/4265/1805/files/40427559117.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2100/files/lopaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/80331974251.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/
    • https://murodebedani.files.wordpress.com/2020

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db3.bin
398467bcb1ae1ef217d1e6980e23fdb1719fdcc5b5ae4cb20b87d46190765f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB3 5036 bytes
font_01_sfnt_off00007ede.bin
68f2b56aeba4abac1c4340c579024f23131237c96375a01ab29899e8e284fd99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDE 11112 bytes

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