Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7d9ca6848a683f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-20 18:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0b8ae7fa2bc27d1c223bcc0c03a707 SHA-1: 22155411505d9410f865319f0d5c7dab14f444d6 SHA-256: 6e7d9ca6848a683f045ce75bfe93102b61838bb74ac1aac6d5cd826fbccde8d2
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by a machine learning classifier and heuristics indicating it contains a malicious redirector link and is part of a link farm. The document body contains the URL https://ttraff.ru/pify?keyword=air+supply+karaoke+songs+free, which is flagged as a malicious redirector. The PDF also contains numerous links to Shopify-hosted PDF files, suggesting an attempt to manipulate search engine results or 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=air+supply+karaoke+songs+free
    • http://rarijap.frostbottomstudio.com/uploads/1/3/0/9/130969916/loduzuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/4604905751.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/background_photo_hd_for_editing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zimupumunilojoduwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/zejimunamemosagimutaxivit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/fuwudaxutopujazemawox.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/87404077640.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufuma.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/loxatijutadubanig.pdf
    • https://cdn.shopify.com/s/files/1/0436/2888/8227/files/wepufazumimejunukigo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/sensory_evaluation_techniques_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/nepali_language_course.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/bopixesesolatidejezatebi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7133/0712/files/the_bully_bluford_series.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/67372082840.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_off00006ad0.bin
4a511ba0349bfe03ed7dcc3703f883716f22b95413603521543935e4c2ecb209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 5224 bytes
font_01_sfnt_off00007cb1.bin
ea2f62d4412a904ddc08b9cd8b1835dc5795043b5a7aa7ab8640d1df070517bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB1 11416 bytes

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