Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c35d119cd5dd2a…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 16:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d40cf15b46f4f9bd3af36cdfc20ec848 SHA-1: 34c28a6310377074a1cf9f976b1ef06d9a26b0a4 SHA-256: 23c35d119cd5dd2ad9494df6d3a6e9b1e2b2780031345c163a9b868bec8f9653
152 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though garbled, contains text related to a 'Yamaha moto 4 80 repair manual' and references the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of similar PDF links, likely part of a broader SEO poisoning campaign to attract victims.

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=yamaha+moto+4+80+repair+manual
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/22576899517.pdf
    • https://cdn.shopify.com/s/files/1/0435/3648/2458/files/carmageddon_reincarnation_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/jejolozuwibira.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cc151931659490da406f5a076073cb9.pdf
    • https://static.usrfiles.com/ugd/eaf48f_c55aa8a7712245f993395539f49fa9b7.pdf
    • https://static.usrfiles.com/ugd/2c608b_e02bcd00e5f14afba5f8c3d68d0d8162.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc315ba13a37423eb33f7e721aefa94c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5de571aa4a814e74853fd86afeb77d14.pdf
    • https://static.usrfiles.com/ugd/b8c837_35f58c7f1bdb4e2b92f86599e2795825.pdf
    • https://static.usrfiles.com/ugd/0c268c_f1d5179230be4aabac9b73d31f7eadb9.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/washing_pole_dark_souls.pdf
    • https://cdn.shopify.com/s/files/1/0430/3709/8147/files/finding_slope_from_2_points.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/charlie_chaplin_2002_tamil_movie_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/fusion_360_beginner_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/dark_souls_2_sotfs_cheat_table.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_off000057e4.bin
cb5c8c6405a97e289a1d37fd8f3fa0fb9a9e5cd02c3f475be668e5c7f8c23a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E4 3312 bytes
font_01_sfnt_off000063c5.bin
7a5cc5917269ea459a92e9b1336dd16ed973b1936983501359146058ddb46d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C5 5264 bytes
font_02_sfnt_off00007588.bin
978d19f49a44cc2195ff0e7d1314089d420d0a04006083e5a7e66507adabb27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 10108 bytes

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