Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23145fc5d392cfb…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 19:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef77dbeb4aeaf9427ed022c69ed5907d SHA-1: 381114d4f630112aaf3fdcb9ad7d4abbf0502bf1 SHA-256: e23145fc5d392cfb167f9bfff044d22aaf01e6b023cb338a2a2adaff2c52d847
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious URL being ttraff.ru. The document body contains obfuscated text and the malicious URL, suggesting an attempt to lure users to a harmful site.

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=demonstrative+pronouns+french+worksheet
    • https://cdn.shopify.com/s/files/1/0462/0124/1750/files/28954836374.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/flight_ticket_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/7976/2073/files/big_java_early_objects_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/polegut.pdf
    • https://cdn.shopify.com/s/files/1/0446/7264/7331/files/bsc_1st_year_physics_practical_experiments.pdf
    • https://cdn.shopify.com/s/files/1/0440/2174/3781/files/bhartiya_sanskriti_gyan_pariksha_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/chloride_ups_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1251/files/fo4_console_commands.pdf
    • https://static.usrfiles.com/ugd/b8c837_535d5e5d905d4592bf1b433bcf1437bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_42a66ad919d34360ae6ce3c67c1ee1a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_091e0d64a517449a8203e8b0dade6a42.pdf
    • https://static.usrfiles.com/ugd/80bfa9_8afea4bc534b46f396c6d37869875508.pdf
    • https://static.usrfiles.com/ugd/b8c837_f607206a59424d43b1c4598ecc782dd2.pdf
    • https://static.usrfiles.com/ugd/24853a_8ee8fce0219b4f519edf7e2553352d8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_76aad2d728b14300a16c97fce72db967.pdf
    • https://static.usrfiles.com/ugd/cdb50c_28b1f5bec3184e23a92698af86f30d6c.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_2c2ab7a616a744a09be550f3775c25b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_874d9c6da6c144c6b21e727e9e793d03.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_off00007063.bin
8a5c28c0027a2fa167341bce46022bc44df865b31e6669ac6cac89b6a4dcc8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7063 5436 bytes
font_01_sfnt_off000082d4.bin
dd6a343a738682f0cc48935b723affebfe2022bf45e24c5881a97379c01d63d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D4 10196 bytes

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