Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f3c6eb1a08beb8…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 14:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f847bb095358af67f46259aaa5e220 SHA-1: e4821c0dd7ce02be4a82e57e18cd717883fcaa70 SHA-256: 78f3c6eb1a08beb891e5e8280e440a04729662b47cd60eb39b1bdd218bf1436a
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=5rd+grade+math+worksheets+pdf, which is flagged as a known redirector. The document's structure and content suggest an attempt to disguise malicious activity as legitimate educational material.

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=5rd+grade+math+worksheets+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/79e0dc_13297f08c921447ab37fddbcd3cf3e5e.pdf
    • https://static.usrfiles.com/ugd/99a8f2_c8721afa88f24f2882be799e2347f161.pdf
    • https://static.usrfiles.com/ugd/735424_8106431f2541449ca80802a55ed019d2.pdf
    • https://static.usrfiles.com/ugd/61f964_dff05fdde06146c394a235d3457add86.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6174b4b10694f6aaf6d5218462505bf.pdf
    • https://static.usrfiles.com/ugd/1a89c8_8f4f87373d5d4e7694a05b2749ac2a0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_70e854ce6a3d4db89aedaaf136a267a3.pdf
    • https://static.usrfiles.com/ugd/3b7182_7051b05ef31b4cc48d20e92e73c694f1.pdf
    • https://static.usrfiles.com/ugd/67f5f7_310bf672b4054249b6705932a7b47dc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_580575a57c014bba9314d1ad3098713d.pdf
    • https://static.usrfiles.com/ugd/b8c837_023fcff311f84dc89e92900234c5be53.pdf
    • https://static.usrfiles.com/ugd/c83fdb_934546da3f4a4a27a1896c56a41845c4.pdf
    • https://static.usrfiles.com/ugd/11f207_b196d9f7f51b4438b73a2bbbd7d02f47.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/99176298096.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/sitonolunudejoxiluxiboxow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/laxefasigapabaxirasu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/30624362438.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/bank_al_habib_branch_code_list.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006049.bin
3ed04e963b60318db68b754798544ac289587cf2ee570ef2c5c37d95d5f0641e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6049 5608 bytes
font_01_sfnt_off00007348.bin
be718a94bceb9f1bed0af2471a0935756fff8ecbf4c87767c6c60c12e82ffdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7348 9956 bytes

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