Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fddd9af2c68e102…

MALICIOUS

PDF

52.8 KB Created: 2020-08-06 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 110a9e3d281ef7c575c3a8148aed7d0f SHA-1: 2c092f90850986a2331394c9a9535c875bb40e75 SHA-256: 5fddd9af2c68e102ae039c3721c23f1832df9d976ca8ad9c794be8b3fae88bc8
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 of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=partituras+de+aguinaldos+venezolanos+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious infrastructure under the guise of providing search results.

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=partituras+de+aguinaldos+venezolanos+pdf
    • http://zuran.hgfoundation.com.au/uploads/1/3/1/6/131606060/vifewajuworaw.pdf
    • http://files.shift-counselling.com/uploads/1/3/1/4/131437319/tulojume_parivivera_domun.pdf
    • http://files.relaxingcottages.com/uploads/1/3/1/3/131398164/zuwejas.pdf
    • http://files.frocksunderground.com/uploads/1/3/1/3/131384286/foxurosewiju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/jurnal_tentang_alkali_tanah.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/53137525316.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/metofovuvatide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/35646193689.pdf
    • https://cdn.shopify.com/s/files/1/0439/1046/3643/files/5409399778.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/16049031626.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/wrong_side_of_heaven_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/novuguvozixiropunab.pdf
    • https://cdn.shopify.com/s/files/1/0438/3123/0624/files/craftsman_917_mower.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2581/files/vumupukitogufepurofewukul.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/comment_fusionner_des_fichiers_en_un_seul_fichier.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/migubiruxabeleduzivotet.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_off000081ec.bin
922a9396278ef168a3948a28250567482bf0c26a3be49b8467c8984f67d7d6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EC 5320 bytes
font_01_sfnt_off00009426.bin
b8a41dfbc8304c4e70884f4ce9e080913a9a190c65b17c6797a851d0d9a46ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9426 15688 bytes

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