Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe809891f6915a6…

MALICIOUS

PDF

47.4 KB Created: 2020-08-30 12:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abbc7f941308fd5ab471f15fc61f24a9 SHA-1: b0bc075ad81784b1a2e8f2af33a497c26105faf1 SHA-256: 5fe809891f6915a6a37bfe2de1e9d8feb971b5a72bb5fafc21f84dc4ddf2308b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/wix?keyword=present+simple+exercises+pdf+busy+teacher'. This suggests the document is part of a link farm or SEO manipulation scheme designed to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

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=present+simple+exercises+pdf+busy+teacher
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0445/7247/5556/files/jungle_book_cartoon_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/uud_1945_amandemen_4_lengkap.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/89320348457.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/3193389981.pdf
    • https://static.usrfiles.com/ugd/b8c837_a780f57ea863475ca22299a17a996c91.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9611631e2c47a1bae29aa0f52696d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e175e5fc7a024085aeb4e680d025616e.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1364/files/79213653981.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/raspberry_pi_netflix.pdf
    • https://cdn.shopify.com/s/files/1/0437/5638/8510/files/27055123736.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/god_of_war_betrayal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/basics_of_electrical_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/91400484431.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/120_kilos_in_pounds.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/kixakuforixukujudibitefof.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d4c.bin
258b5978d1be1504d6d37ebe4d8c144f2dcd425abac889e20572031cf8ce1171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 5476 bytes
font_01_sfnt_off00007fb2.bin
cefdca3255935e28da3bfa1b0fdad1240a0839adcccd507fe95132b74e0a27e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB2 10120 bytes
font_02_sfnt_off0000a24d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA24D 4324 bytes

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