Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c2437b91268884…

MALICIOUS

PDF

46.2 KB Created: 2020-07-27 15:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858b8fcabebfac08709493f4dc8b87c3 SHA-1: fe2384afc3796e10e9711a98a0201875a3fbd87f SHA-256: 01c2437b912688846544fa26da6456ab0b213b62bfc1441b627878e0e4b84dc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malware through a network of compromised sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious redirection scheme.

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=article+of+association+template+uk
    • http://files.slang4201.com/uploads/1/3/1/4/131483143/5370528.pdf
    • http://files.subconsciousprogramming.org/uploads/1/3/0/7/130776001/94bd96.pdf
    • http://files.golfclubmd.com/uploads/1/3/1/4/131408528/sidexagolopikodagi.pdf
    • http://files.dknightwesmedia.com/uploads/1/3/1/0/131070452/dufujofej.pdf
    • http://files.kramersearch.com/uploads/1/3/0/8/130814754/gedokitiwedi_bimowojesuguv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/borajafekinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/fiwipap.pdf
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/12812063658.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/80655417912.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/gifewubevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/23991207951.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/fanovazenarutowewozawazu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/18401835786.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/wakiwug.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/82379505139.pdf
    • https://cdn.shopify.com/s/files/1/0436/3862/0318/files/81086271453.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_off00007794.bin
42241e039bb071e03eb97dc76c3eb6c891cc1fde3cecb985c2597b4bef2b5f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 5096 bytes
font_01_sfnt_off000088c9.bin
e0c5acaab8344ba8d7e313522276a1fb222040edd50502c39b36f35acd27e918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C9 10044 bytes

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