Malicious PDF — malware analysis report

Static analysis result for SHA-256 8644711dae535e95…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 23:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adc4fc07ccbc6115a73f442acd6db6b1 SHA-1: 9990415b941db2c83c6d6f27994c7509af9ac782 SHA-256: 8644711dae535e9504fb2e88904b30262a310398ec96ab81cb5a5a7d3b0b5f38
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=bluestacks+for+android+apk', suggesting a phishing or malware distribution attempt. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which are benign Shopify links but one points to a potentially malicious domain. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and the target URL, indicating a lure for software download.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bluestacks+for+android+apk
    • http://files.elltells.com/uploads/1/3/1/4/131453902/2e9dcab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0386/9346/files/96622516554.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/domain_driven_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9049/4119/files/65700289834.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/swerve_driving_school.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/advance_system_care.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/pofamarigonanomilelutuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/gefepujokezopevikaputux.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/jawonufijorixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/hypertension_ppt_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/giwisogijakemo.pdf
    • https://cdn.shopify.com/s/files/1/0462/0048/8089/files/logobuvox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/amrita_pritam_books_punjabi_download.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_off000069c3.bin
5e9b288ee4698fd098337ae2a77fa79684df7c0f174d2955bd66047b0ea66c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C3 5260 bytes
font_01_sfnt_off00007bb1.bin
2681d18cf4ac646e9ff53e0b8063ae4e6d845b99b183ac426a6d3b26dd0ce4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 10120 bytes

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