Malicious PDF — malware analysis report

Static analysis result for SHA-256 6501b6d5f29231a1…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 16:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c1a6707bedcd7e1a54bc14838cda121 SHA-1: 858e15ac6c138bc18dac3f1d9ee69941192dda26 SHA-256: 6501b6d5f29231a1e9f71fb08e586f04d1ffc7217fd3ee06519318ee9dc449f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is https://ttraff.ru/pify?keyword=klb+biology+book+1+pdf, which is flagged as malicious. The document appears to be a link farm, attempting to lure users into clicking through to potentially harmful websites under the guise of providing academic resources.

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=klb+biology+book+1+pdf
    • http://wixive.mrobinsonartworks.com/uploads/1/3/2/6/132681670/kakobezu.pdf
    • http://files.acuedge.net/uploads/1/3/0/8/130874416/9663850.pdf
    • http://files.janaina-vieira-marques.com/uploads/1/3/1/4/131436967/1213616.pdf
    • http://files.austinhighseniors.com/uploads/1/3/0/9/130969656/a1f4bcbd6.pdf
    • http://files.activediabetics.com/uploads/1/3/0/7/130738603/442238.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/17547420669.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/regujoramomirenawotosari.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7701/files/38196666583.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/final_fantasy_vii_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7640/files/38963261587.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/62790071517.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/bazekasufikozek.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/wazuliludawanometegusug.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/24900857039.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/webasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/64668060898.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_off00005c99.bin
203947723b8e15c092e11652c8962c02b4aa810278f74a9701b6311193f07c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 4536 bytes
font_01_sfnt_off00006c0b.bin
580c1e698e3fd29123efdb566b07766ac43949327c06c471288adf7e6ffcbe85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0B 9984 bytes
font_02_sfnt_off00008e12.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E12 4324 bytes

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