Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d1a7f39b05e231…

MALICIOUS

PDF

41.7 KB Created: 2020-09-02 00:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df9af439e6ca33cc125bb14097ed053c SHA-1: c6b7b4f826a271f42df303142ec755a7c6be56d1 SHA-256: 26d1a7f39b05e2311f049a5a0866a9f93834594d7323542e4ea63afaf39daf6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=omegle+tv+apk+mod'. This URL is presented within the document body, disguised as a download for 'omegle tv apk mod'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to 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.cc/pify?keyword=omegle+tv+apk+mod
    • https://static.usrfiles.com/ugd/b8c837_e17292eb6db1468bb6f5aa040c921649.pdf
    • https://static.usrfiles.com/ugd/60933b_485482550f6048288d02a562b5506a5e.pdf
    • https://static.usrfiles.com/ugd/682d1c_b469ff8ede354fbbb2ff803005eb6c5d.pdf
    • https://static.usrfiles.com/ugd/41f880_2d33a13ab1aa4539afab54a9d895d374.pdf
    • https://static.usrfiles.com/ugd/c1615c_e71359772ec348b7a2e763ea06d1fdf8.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/xusapasij.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/dibezag.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/amazon_kindle_email_convert.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/32608779255.pdf
    • https://cdn.shopify.com/s/files/1/0434/1635/4978/files/funciones_del_texto_argumentativo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7562/3320/files/1940133403.pdf
    • https://cdn.shopify.com/s/files/1/0430/3172/4183/files/94325427430.pdf
    • https://cdn.shopify.com/s/files/1/0434/1399/5672/files/metro_sports_report_football.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/73069966179.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f09.bin
ba3222bba23940e81942410f1cd481bdd8287c4a2af804b72557be5a336d48ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F09 5156 bytes
font_01_sfnt_off0000608e.bin
615c21019c8949fc234d93a96512f400dafd28cd217193cdf4285215c76caf7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 10220 bytes
font_02_sfnt_off000083c0.bin
08fcf2a57ac386ce89fe0a905c8b4728b7f81ec1b1e9521a026ea339897816d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C0 16608 bytes