Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cee729c8b31874…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 18:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c20723f33a4ab69a6fb034c1036d58a SHA-1: 354b9715b300d3769e3c021b9625cb5570c7ee53 SHA-256: 13cee729c8b318749f455086e70bf97d33ba611cb685684813cfccff4e9ecd5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to external content.

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.com/pify?keyword=definicion+de+anorexia+pdf
    • http://damazu.gebhartcounseling.org/uploads/1/3/1/1/131163494/rubusawilurikolida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/tratamiento_retinopatia_hipertensiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/36175454974.pdf
    • https://cdn.shopify.com/s/files/1/0431/7750/9020/files/paxideguxodebawerojirage.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/paradise_kiss_movie_english_subtitles.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/kiborug.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/minecraft_place_block_command.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1326/files/dumuluvamonipuwagolododiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/category_6_day_of_destruction.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e58.bin
497ca663c4c1954f9fa8bdaccc575da76806bb7796dc018c7047f26ecf6d214d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E58 5004 bytes
font_01_sfnt_off00007f72.bin
95a19b3c7d513c22852aac9dfe9975f6f127e4b7e4bb3cc138660294d84971e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F72 10212 bytes

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