Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f7b99e309f247d…

MALICIOUS

PDF

37.1 KB Created: 2020-08-25 09:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ceae95dbed939fb26980f1f795f132 SHA-1: c2ef9badcf8f6a646e4518344f6e49b7e920c989 SHA-256: c8f7b99e309f247d69b4876058024cef2ddf4467faf3908b1419f4470915f3a6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits malicious behavior through a large number of embedded links, with one specifically identified as a known malicious redirector. The document appears to be part of a link farm strategy, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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+banner+vector+png
    • http://files.flyskyleader.com/uploads/1/3/0/7/130775363/5666356.pdf
    • http://files.auroraprofessionalhomeopathy.com/uploads/1/3/0/7/130739232/kejiribevol_vopofeto_pipixewelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/tawinunokapidedeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6799/files/chess_board_3d_model_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/wogolivonilegibawojalox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/55319597972.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/98399353717.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/best_free_to_play_cross_platform_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3077/files/ejercicios_de_paises_y_nacionalidades_en_frances.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/18024840504.pdf
    • https://cdn.shopify.com/s/files/1/0428/6752/3743/files/cancer_pulmonar_definicion.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_off000055e3.bin
f930f5e3aa25eb92d02b17888152f5dd20480be193b0ffd27e7ed1d552cea309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E3 5224 bytes
font_01_sfnt_off00006792.bin
e5e5736f7ad71e58603a5a6b0b57e06676d18e2e819b2dcc62087ca594024266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6792 9536 bytes

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