Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47eb8484f731ed7…

MALICIOUS

PDF

44.6 KB Created: 2020-09-05 09:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b4e8e4c1128ae48208e9a72e036236 SHA-1: 702a062d5ff68f5c3deb4433f405dcbbf7de266c SHA-256: e47eb8484f731ed717ce0ea9966673b4e5c40a341c3c4eb44bf537c607ee2b10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=bengali+book+pdf+file'. This URL is presented within the document body, disguised as a link to a Bengali book PDF. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', suggests a link farm or SEO poisoning tactic to improve search engine ranking and lure unsuspecting users. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=bengali+book+pdf+file
    • https://static.usrfiles.com/ugd/64f9d2_64d9ad6adf0a4ad89ea82c87259ce224.pdf
    • https://static.usrfiles.com/ugd/868b90_457182997c094205b7e39167759b9e0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b245ac30c3ab4fa78e52fc08e4aee042.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_d59068bdfbe94a00afb6c4ea41005813.pdf
    • https://static.usrfiles.com/ugd/2274a7_fe2f2338a31d4ec5829364df8f6c13e7.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/butterfly_kisses_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/scr_c106d_datasheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_b012b1bd8bbb4e509d7b0874d4704213.pdf
    • https://static.usrfiles.com/ugd/fa32a6_c90a6f2feea8487d83a7f2c2eb68ea46.pdf
    • https://static.usrfiles.com/ugd/73c254_2b20ab7ba4f5410986aea21a9423a063.pdf
    • https://static.usrfiles.com/ugd/f84671_d88f364e1c6e4194beb4f63745bfb5c7.pdf
    • https://static.usrfiles.com/ugd/35e1ce_08e40d232f7f4b37a14613a80468c0a3.pdf
    • https://static.usrfiles.com/ugd/b97cba_dc73c7fe089440d08fc96a15a34433d2.pdf
    • https://static.usrfiles.com/ugd/a13bc2_6cdf1609030040fa91f53c88bd65f85a.pdf
    • https://static.usrfiles.com/ugd/49488e_a7af0097a6c049dabfbc2b9777c4a40d.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_off000052ea.bin
568f49aa48763be931edd4a9562bfe53d5794ff21c9b02318ea85806460811fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52EA 5188 bytes
font_01_sfnt_off000064a6.bin
9ffe40147d16ee9c4f44f7c0c9bf717eb68e9779290f8460b668f76092a82e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 10036 bytes
font_02_sfnt_off000083a3.bin
7282b023f3dd38e2875e30cf7d8e0f42b3b1671d0b8480127b88d215a684e299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 9928 bytes

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