Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcfc55b7b1685dc…

MALICIOUS

PDF

36.3 KB Created: 2020-08-11 03:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b671b738a035b38943b964bc2f875681 SHA-1: f129daa6f80aeff69c41c800c027b21cc30ea2c9 SHA-256: 9bcfc55b7b1685dccef5cfb28b6a87d2b3ccbc74675dce0de569639116542c8f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Accounting for management mcq pdf' and the malicious redirector URL, suggesting a lure to trick users into accessing malicious content under the guise of educational material. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=accounting+for+management+mcq+pdf
    • http://vekasoki.heathersansonephotography.com/uploads/1/3/0/9/130969368/xezotip_fojod_vipexenasubojij.pdf
    • http://files.fpcfranklinpa.org/uploads/1/3/0/7/130775260/fanodiridekazalite.pdf
    • http://files.farhadsworldwideblog.com/uploads/1/3/1/4/131437669/7c8d91a.pdf
    • http://files.emilyhuntermft.com/uploads/1/3/2/7/132740214/01aaf55.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/26108200448.pdf
    • https://cdn.shopify.com/s/files/1/0440/3517/8661/files/landscape_design_plans.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/blague_de_toto_courte.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/98698467005.pdf
    • https://cdn.shopify.com/s/files/1/0440/8256/1176/files/xafulexeturefotifut.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/fomitiroretizulamiweto.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/95101216032.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/sebosavimutevekiwiresa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/dnd_3._5_players_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/92275851.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/classification_of_phylum_arthropoda.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000508d.bin
37e4967ebd97ea8bc02ae1ffc00f1e0ef5a879433f9a96fe5cf9e5d86b21ac17
pdf-font-stream PDF embedded font (sfnt) at offset 0x508D 5380 bytes
font_01_sfnt_off000062b2.bin
4d2cf3ae86adc2d9d54f9b747678d1e84982906c370e23989dd48c3efc75acda
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 9824 bytes