Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e26d09ca2b0fe22…

MALICIOUS

PDF

52.6 KB Created: 2020-08-22 00:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 327923b485910a7f198bbb407ab79e50 SHA-1: 0f1a77de3e1d7e16e1c7fbebc10195053b1637a4 SHA-256: 6e26d09ca2b0fe22fceae412c430d623ec63c6e4cbc7218c45fa3803200bc88e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'video call recorder app apk' and a URL that appears to be part of a link farm designed for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirection heuristic suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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=video+call+recorder+app+apk
    • http://files.duckinn.co.uk/uploads/1/3/1/3/131380504/339f4e5ffbc990.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/depiwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/59746929758.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/68833928908.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/gofen.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/geleperob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/jesuzivemek.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/wagig.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/kagarabamo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0663/7726/files/keratoconus_diagnosis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070da.bin
5b33129aef6c3591c6efde0f1d29013244767ff6c9252fe3673bf2ff20307727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 4916 bytes
font_01_sfnt_off0000819a.bin
84250fe9e973baedab93eecef39c5d043b5b1dce11988f7c448fdffff1fe7a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 1872 bytes
font_02_sfnt_off00008aa7.bin
cf9d00083208af2d5c791ed23521bcd77aadf37623b6963b56ced1c8c4b0e0da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA7 10792 bytes
font_03_sfnt_off0000afca.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 16164 bytes

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