Malicious PDF — malware analysis report

Static analysis result for SHA-256 74264be28ae8f1d0…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 00:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 251f485f596d6448337e56447ed27dea SHA-1: 793fb98eb1442aa22b4a608aea3aaeda879eb3b4 SHA-256: 74264be28ae8f1d01806985b15e18bb578acbac33b87f27466a4cd2a3462fd3e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=biochemistry+books+for+mbbs+pdf', is flagged as a malicious redirector. The document also functions as a link farm, directing users to numerous other PDF files, likely for SEO manipulation or to obscure malicious intent. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful 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/wix?keyword=biochemistry+books+for+mbbs+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1412/6759/files/jexupumeromugifujoniviva.pdf
    • https://cdn.shopify.com/s/files/1/0429/6310/8003/files/17344449069.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/88535396194.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mulobovapu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5370/9472/files/edit_nightbot_commands.pdf
    • https://cdn.shopify.com/s/files/1/0435/5499/6375/files/aldo_rossi_books.pdf
    • https://static.usrfiles.com/ugd/5cf23b_6a189fb517e84eb4a9cdcb175d904dbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ec1a1d830b44764a98a65e00688bf9c.pdf
    • https://static.usrfiles.com/ugd/451461_4a55004089ba45b1aef677605f06dde9.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_d82edbacceaf4ba78880da977d7b0de1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9d5730f48464529ad166e3f86affca9.pdf
    • https://static.usrfiles.com/ugd/19ce5d_db1b3a118a9b459f86af30cdd5c9afff.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_f665e2b6578a40549ab14a050edb5014.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006433.bin
08b5a7d503f7270da18036d1f77d9a8d3f6483daab0af557cdac71eb40ac42d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6433 5192 bytes
font_01_sfnt_off000075d9.bin
96d2b7636cfdf4b4eb552658ebc318fee1483c7b21445cfe309ed322121e0ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D9 9412 bytes
font_02_sfnt_off000095fa.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FA 4324 bytes

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