Malicious PDF — malware analysis report

Static analysis result for SHA-256 36913ba061a7fff0…

MALICIOUS

PDF

47.8 KB Created: 2020-09-29 18:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fee6dce01a58db4a117dd2f035c944de SHA-1: a400e330749d8cfa76ccecbe2ddf63900801e058 SHA-256: 36913ba061a7fff07269b9b4b79ceb0e5a4dce942d90ab68e45279b95980f6ed
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though partially obfuscated, contains keywords related to financial fraud and references the tool used to generate the PDF, suggesting a lure for illicit activities. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/pify?keyword=i+need+a+blank+atm+card+2020+post+comment In PDF document text
    • http://xugal.pamcaron.com/uploads/1/3/0/8/130874134/zufazakedu.pdfIn PDF document text
    • http://bujur.melissahaneyart.com/uploads/1/3/1/0/131070571/zobarodukuvof-zopamolasunix-wafuzevitewube-tasonodediwafej.pdfIn PDF document text
    • http://zalev.jewelz4you.com/uploads/1/3/1/6/131607305/samovelun.pdfIn PDF document text
    • http://files.ponywagondays.com/uploads/1/3/1/4/131437064/ab7354ace.pdfIn PDF document text
    • http://files.obsidianleague.com/uploads/1/3/1/4/131453543/6749479.pdfIn PDF document text
    • http://files.shaunmatthews.com/uploads/1/3/0/8/130813846/bejifegi.pdfIn PDF document text
    • http://files.prettycardsandmore.com/uploads/1/3/0/9/130969465/vedokekegoxed.pdfIn PDF document text
    • http://files.southerncrossadvisors.net/uploads/1/3/0/7/130775998/83ea53.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/27608048159.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/4013711497.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/17481147675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/most_important_days.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 5636 bytes
SHA-256: cec2bf5a37b05581fe9a67fcf64d76aa0007e82393a65a32188255bf86a1df31
font_01_sfnt_off00008dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAE 10840 bytes
SHA-256: f8a6ab2d7a793a502a7b185ee75f985da02ab2b3d23a7b834f23f26bbfe50739

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