Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd86e8c855e111e9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-10 05:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20e4781f71dda271dfcd48ba0b5f036 SHA-1: 849f1093a1a15dfc8cd88d30a9d72863e2b6bf7d SHA-256: dd86e8c855e111e948d62be1d67207e3fdfb412b12030e1f91af3f4cda969dab
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The ML classifier strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.cc/pify?keyword=nuevo+formato+de+certificado+medico+escolar+sep+pdf, which is likely used to direct users to further malicious content. The document body, though heavily obfuscated, contains references to educational certificates, suggesting a lure.

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.cc/pify?keyword=nuevo+formato+de+certificado+medico+escolar+sep+pdf
    • http://files.foolscaptheatre.com/uploads/1/3/1/4/131437005/d416907ea1d4726.pdf
    • http://files.melaniebartelart.com/uploads/1/3/1/0/131069890/5621904.pdf
    • http://files.ivan.mrslambsroom.com/uploads/1/3/1/6/131606165/679719.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/19094974551.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/jalim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8377/5643/files/snes_mortal_kombat_2_moves.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4743/files/42417868319.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/77484939870.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/descargar_battle_royale_manga.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/97832529888.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/nobebilavidagoxonolig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/transistor_amplifier_types.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/68363948942.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/fujidaxuvuwotilopaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/animal_farm_book_online.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_off00005c62.bin
601c099d2d4a353ef9de5baace9af7c170a8cae6ce891bd6438c74b4067f7dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C62 5108 bytes
font_01_sfnt_off00006dd5.bin
e6a6ec9d5c64065fe951676f1c8aac0bb1be05da24f76ebe263a54d79e690cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 11164 bytes
font_02_sfnt_off00009220.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9220 4324 bytes

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