Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fc07ebca0955ad…

MALICIOUS

PDF

50.8 KB Created: 2020-08-11 17:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d83353120363adde5d9b032aac484424 SHA-1: ac4d8bf4b6a179f6f1ad5488311eab5a9700e613 SHA-256: 26fc07ebca0955ad181002d9cc64c837bf4173020b51ae301c4ea82f74c21c15
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/wb?keyword=demonetisation%20essay%20in%20kannada%20pdf. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=demonetisation%20essay%20in%20kannada%20pdf
    • http://files.heryellowribbon.org/uploads/1/3/1/4/131410685/liwipefizosapenubad.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://files.wombatmotorcycles.com/uploads/1/3/1/4/131483778/sefijijot-lesal-nariwin.pdf
    • http://logexo.ideamonterreypark.com/uploads/1/3/1/6/131606289/a6bb3164fc58.pdf
    • http://files.makeupbymaricris.com/uploads/1/3/0/7/130776162/2990877.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/3670032019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/18660314824.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/the_magician_king_lev_grossman.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/76905619550.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/jurivelonokil.pdf
    • https://cdn.shopify.com/s/files/1/0446/9823/9132/files/picadora_de_pasto_casera.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/boy_scout_cooking_merit_badge.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/jowabafogidamewesen.pdf
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/bhagavad_gita_chapter_11.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/honeywell_yj5900.pdf
    • https://cdn.shopify.com/s/files/1/0435/2308/0344/files/first_data_fd130_user_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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006389.bin
13d48e838abc0e6def30d1c40dbf6fe226ba7ad3e3fb31533cc677ed049d2d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6389 5224 bytes
font_01_sfnt_off0000754e.bin
ec7bc40a802bc7dcc583e3878529466b098246a830111beff0ad1308f48ea300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754E 15768 bytes
font_02_sfnt_off0000a675.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA675 16164 bytes

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