Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf66c9d523b6a6a…

MALICIOUS

PDF

36.9 KB Created: 2020-08-28 06:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 632f738950f211bd88e8c4b7b2496757 SHA-1: fb3af8a58ec1f3858cacf0d7dd0bdea61cff798f SHA-256: 7bf66c9d523b6a6a87bb1c0e6c8d20637f261b15f3d7c781c3af4f65b0774926
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Examen de matematicas primaria 4 grado' and includes the malicious URL, suggesting a lure to trick users into clicking. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=examen+de+matematicas+primaria+4+grado
    • http://files.jamessanders.biz/uploads/1/3/1/3/131380342/3fc7b1a7a4.pdf
    • http://wivab.cigarclubmodesto.com/uploads/1/3/1/0/131070851/nixozujuwonezekoz.pdf
    • http://files.judicheco.com/uploads/1/3/1/6/131607712/9605056.pdf
    • http://zemuwuwed.bodyandsolspa.com/uploads/1/3/1/3/131383483/lasopodepa.pdf
    • http://files.travelwhisperer.org/uploads/1/3/2/6/132680896/xazakuwo-xugibobibi-mizerirezixi-rowowo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/25738420314.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/84185801522.pdf
    • https://cdn.shopify.com/s/files/1/0435/7518/1471/files/vakelazadasom.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/neverwinter_control_wizard_build_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/convert_to_word_acrobat_professional_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/kivafesiwuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/45470744794.pdf
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/himen_falciforme_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/los_caballeros_templarios_historia.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/xujosimerofegevibej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4143/9400/files/pasunox.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/6742476103.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_off00004ee6.bin
4c0f145f00a7e527e3fa4b1392e2e75a8f8323f4af5c81c8923a3be4b6f2efbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE6 5476 bytes
font_01_sfnt_off00006179.bin
25af5e3810220118b77a5cac0ee9e1005df97b87376a57b983211879d1ff6a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6179 10816 bytes

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