Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a3e2c3adc7d7b8…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 00:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ece1b20761ef2b118e43f018240552 SHA-1: 5d06ec4680f84db313bce75a7583ae6bfdd5d5ed SHA-256: 76a3e2c3adc7d7b8e375589ed954d7cff074312d4d1502f04c5ddc0bdd184884
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to PDF files hosted on Shopify, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=google+drive+apkmirror', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the malicious URL, suggesting an attempt to disguise or obfuscate the malicious intent.

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=google+drive+apkmirror
    • http://files.montanalanguageteachers.org/uploads/1/3/1/3/131379217/81740e7af12a7b5.pdf
    • http://files.heartblendfm.com/uploads/1/3/1/4/131406082/golutatog-limijipegibo-luwewariv.pdf
    • http://wikasakax.sophisticatedladysalon.com/uploads/1/3/0/8/130874207/7475416.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/8921/6163/files/fakonara.pdf
    • https://cdn.shopify.com/s/files/1/0428/3102/0198/files/13030023151.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/19033470518.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/83473521471.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/93226812149.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/60142273315.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/carpal_tunnel_stretching_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/nulexaziwosujavogugewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8903/files/lisemalupo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/casio_protrek_prg_270b_manual.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/brooklyn_nine_nine_season_6_complete.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_off00006912.bin
ee4e4b99812bf3304fb3a1457bc8450f343f7accf2b0c2da1844ee47fe9333a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6912 4856 bytes
font_01_sfnt_off000079a0.bin
031c17213dbd9d251b0f9aed7145da0c16cb14b169fe2c78162aebb34dc53b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A0 9888 bytes
font_02_sfnt_off00009b90.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B90 4324 bytes

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