Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f456d05b6a94c60…

MALICIOUS

PDF

57.0 KB Created: 2020-08-29 09:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f1a6e1c6a816c6a427fb747f55a5624 SHA-1: 4063a857b9a4215ea86fd01255ff5ea4bed5dd0c SHA-256: 7f456d05b6a94c60ac0cdb8d14d81656f86bfd6a04f6471192ed95f4d82790aa
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.cc. The document body, though heavily obfuscated, contains text that appears to be a lure related to a book summary. The PDF also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to improve search engine ranking for malicious content. The ML classifier 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.cc/wix?keyword=the+secret+history+of+the+mongols+summary
    • https://static.usrfiles.com/ugd/b8c837_879096ab34394befbb45a06787a03215.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ea20d14b0140ecba4d52c61cc1b7ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_397b01c663804c56932f6a0e75d11248.pdf
    • https://static.usrfiles.com/ugd/b8c837_a96d25c4cc5c480582757f9d36e12178.pdf
    • https://static.usrfiles.com/ugd/b8c837_52b1f7723aae4e51b8b7a0f5db87dec4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/author_s_purpose_activity_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9849/files/championship_manager_2010_psp.pdf
    • https://cdn.shopify.com/s/files/1/0439/7550/8126/files/zalumilid.pdf
    • https://cdn.shopify.com/s/files/1/0435/4159/4266/files/if_function_excel_timesheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/4606/0710/files/83957126051.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/game_band_of_brothers.pdf
    • https://cdn.shopify.com/s/files/1/0448/0840/5152/files/beethoven_moonlight_sonata_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/xeroxodaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/fidalinegubomekatow.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_off0000842b.bin
9b678d694acd716aec6362e2c75b86facf2255de1ca639103a3f9f70ec59cd9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x842B 7448 bytes
font_01_sfnt_off00009d20.bin
f76aed2a46564ce527856fccaed71936f3552faeb9bc36b421654491234b6de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D20 5348 bytes
font_02_sfnt_off0000af36.bin
cd66ddaf48eac788275d96e2272c81c38530c98fa7497e4306bea1d067d09cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 12216 bytes

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