Malicious PDF — malware analysis report

Static analysis result for SHA-256 74468137f59e65ce…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 13:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f28f8aa9ecd9ee197be37d5e4ff17b7 SHA-1: ec1df39ab9a45b26e0157d160c54591f60b337e8 SHA-256: 74468137f59e65ceca16a2337f0a7475a74e774b023a33efea30426920a027f9
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, contains text related to sample papers and a URL that appears to be part of a link farm designed to improve search engine rankings. This suggests the PDF is used to distribute malicious links under the guise of educational resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=brilliant+pala+screening+test+sample+papers+for+class+10+pdf
    • http://files.johndfalla.co.uk/uploads/1/3/2/8/132814071/zemojum-riwedetunore.pdf
    • http://files.almahdan.com/uploads/1/3/1/4/131438299/ad816f.pdf
    • http://files.paxtonchapelchurch.com/uploads/1/3/2/7/132741334/befufevawolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/cursos_de_ingles_basico_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/tuboj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/79127329341.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/cavendish_university_courses_and_fees.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/jquery_xml_to_json.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/kujifupezegirurunirike.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/sukerabevapizumoxitixinad.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/83941058406.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/adrienne_rich_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/welomomafevavopevetuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6612/1623/files/55287640012.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/algebra_booleana_teoremas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/goruvowivomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/7989/files/1st_grade_phonics_book.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_off000061ea.bin
f8b659fd0f8d76bcfd6c7cbce3b38684fbef57bca32d7579efe73f23e38dc477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 5720 bytes
font_01_sfnt_off0000753d.bin
71ff69e619555a35c2101ac68b932d70cad6b59c4a0fa6f3e200d0f269d2ed9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753D 10192 bytes

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