Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af15974868cf973…

MALICIOUS

PDF

49.8 KB Created: 2020-09-02 02:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26ad3732d165240efcd48219272c473f SHA-1: 899277b10aec8df3da7621544a02a4895d164432 SHA-256: 9af15974868cf9730c734241d8b30ca878e19af8973a29d54e7c46fb73aa1731
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, pointing to 'https://ttraff.ru/pify?keyword=template+covering+letter+for+a+job'. This URL is embedded within the document's body, disguised as a job application template. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm heuristic further suggests an attempt to 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=template+covering+letter+for+a+job
    • https://static.usrfiles.com/ugd/32777b_5d829cb8f9c842faa02cb1fc66ed8e8a.pdf
    • https://static.usrfiles.com/ugd/c63dba_05103d7cc1af4027b65203863434266d.pdf
    • https://static.usrfiles.com/ugd/c6ac46_8c68f2ea99054857a50eb08effd4c073.pdf
    • https://static.usrfiles.com/ugd/12f4eb_de7da0259f6b45cd81157442916dcc4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c02035af460e4bfc92c6e51eb577c4a0.pdf
    • https://static.usrfiles.com/ugd/760101_7472442c74424ea8be538317ddad1f07.pdf
    • https://static.usrfiles.com/ugd/b65acf_142736a7a0314681bb80ea63cfa693e7.pdf
    • https://static.usrfiles.com/ugd/ca32a8_eb8f19c11cbf45b394ae06ab735b9c7a.pdf
    • https://static.usrfiles.com/ugd/a59130_2f0ce83217db46818233a991f7b6ad6b.pdf
    • https://static.usrfiles.com/ugd/409ca8_28ab72b83e7440ad96d7448fd28e07bf.pdf
    • https://static.usrfiles.com/ugd/defcb2_b7630af8c5b7478289f902653e65125a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e14e57d5b084f45bf420dce094d6a1d.pdf
    • https://static.usrfiles.com/ugd/e6092c_1617d02272294cc485ccf869ad6b3abd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2aa9860549364904b7bd682f9656c6ab.pdf
    • https://cdn.shopify.com/s/files/1/0438/3100/1250/files/betty_crocker_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0465/4576/4510/files/kitilewonukajadasabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/actual_speaking_test_2019.pdf
    • https://cdn.shopify.com/s/files/1/0465/1329/1422/files/vuzitovedirimigad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000843c.bin
e364259b09063b6f388c9d86020563035501a802d5b991d7f6692c95cd79cb60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843C 5380 bytes
font_01_sfnt_off00009683.bin
8bab92517330924c828ee095e585439adbe564e97a0fb3bc7978854017a9aebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9683 10304 bytes

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