Malicious PDF — malware analysis report

Static analysis result for SHA-256 da06f3d9a26200a1…

MALICIOUS

PDF

41.2 KB Created: 2020-08-21 18:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 456a8d91162f6b84a6843db3a9417e96 SHA-1: 718d0323f59818b80b5fd49fae6eb21a21b74dc3 SHA-256: da06f3d9a26200a1e52d4252f65204365d8fcaa1f650d0e71eef6eacd95cfdca
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though partially corrupted, contains text related to 'maths worksheets' and a call-to-action phrase, suggesting a lure to disguise the malicious redirection. The primary malicious IOC is the ttraff.ru redirector URL.

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.
  • 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
  • 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=maths+worksheets+ks1+free+printable
    • http://zexake.prssalb.com/uploads/1/3/1/3/131381706/riloruduw.pdf
    • http://files.fixthepilotshortage.com/uploads/1/3/2/6/132682905/2155d2d.pdf
    • http://files.mercedffa.org/uploads/1/3/2/6/132681910/08bf5d238342ed2.pdf
    • http://togefe.frankstonpsychology.com/uploads/1/3/0/8/130814328/bavuxuvu_fadizalar_wowenotewule_lozamirufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/concierto_aranjuez_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/dolmen_mall_tariq_road_store_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/7666/3961/files/nidinobozinowav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/3957570942.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/biwep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/amalgam_vs_composite.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/3214355751.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/conference_agenda_template_indesign.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/resomukowileveda.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0173/files/ibm_cognos_support_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/11th_biology_textbook_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/logezo.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_off00005f9b.bin
1df494d6d3c544f122b19403f96d97427b9aee26464f804e26acc5c7b56ae78f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 5340 bytes
font_01_sfnt_off000071db.bin
708aa9d783b02960379ffdc9a474a4b9c11b11e63f43540053100dacbcc925e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 11252 bytes