Malicious PDF — malware analysis report

Static analysis result for SHA-256 788bd2ab52e9b59e…

MALICIOUS

PDF

46.9 KB Created: 2020-08-26 03:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0c37d73425be254cb894f3a512a4995 SHA-1: 1175e54ee3610843f575f26eca897bb8c8deeba9 SHA-256: 788bd2ab52e9b59ef6c155411f4a1313c1a4a65169fc6af2181c6d29a65f6be7
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 document body, though obfuscated, includes the same malicious URL, suggesting an attempt to direct users to harmful content. The presence of a link farm further indicates a malicious intent to distribute or redirect traffic.

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/pify?keyword=ft8+contest+rules
    • http://files.buzzsonofabee.com/uploads/1/3/0/7/130775286/9280620.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/random_bible_chapter.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/gesejusut.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/nopofa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/beginner_muscle_building_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/strutture_in_cemento_armato.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/86017473772.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/635333467.pdf
    • https://cdn.shopify.com/s/files/1/0433/8830/5575/files/alif_laila_full_episode_hd_video.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_off00007a7d.bin
3d43c9769424bfeb141fcf23b88c417781f723ea0abf97142b6bc5d95a24863b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7D 4732 bytes
font_01_sfnt_off00008a9f.bin
8fd261436b7d3571632c3328a6ea47e3574ffb93189f3a5384c7440296ac58f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9F 10796 bytes

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