Malicious PDF — malware analysis report

Static analysis result for SHA-256 c018144e450864e8…

MALICIOUS

PDF

56.3 KB Created: 2020-08-25 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 039d580322377754b7d4d6a9b95e3d28 SHA-1: a20d6567f0d121196b70a13bdf2aaeb7385c65dc SHA-256: c018144e450864e89ab33a7ab8cfd9df328e85874dbaf4f88cb2656cd806e58b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=bhawanipur+college+kolkata+admission+form+2018'. The document body, though heavily obfuscated, contains text related to 'Bhawanipur college kolkata admission form 2018', suggesting a lure. The presence of numerous external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy to obscure the malicious redirector.

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=bhawanipur+college+kolkata+admission+form+2018
    • http://files.agendaforchildrenost.org/uploads/1/3/1/4/131437736/3265976.pdf
    • http://files.hungary2korea.com/uploads/1/3/0/8/130814258/jemekenulotagix_muzawufukujis_jiwozufamupoxe_meseg.pdf
    • http://files.cookcreativemedia.com/uploads/1/3/1/4/131453919/gawiwiwovawa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/28134278878.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/1338679261.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/woxovumijidegitadifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1562/files/20418087969.pdf
    • https://cdn.shopify.com/s/files/1/0444/2914/8327/files/broken_heart_wallpaper_hd.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6343/files/51903336535.pdf
    • https://cdn.shopify.com/s/files/1/0432/4429/0205/files/class_10_chemistry_chapter_3_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/suunto_altimax_manual.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/
    • https://cdn.shopify.com/s/files/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d14.bin
0785631db3972621424759af92bcf8b55ff159c2623ccdff84ae5c893be73d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D14 6292 bytes
font_01_sfnt_off0000b263.bin
8f110cb30a887a973881bac034a4f0757b564044b61627d0f45ee7ef29e2d1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 9852 bytes

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