Malicious PDF — malware analysis report

Static analysis result for SHA-256 b708c4db7a14161b…

MALICIOUS

PDF

46.1 KB Created: 2020-10-31 20:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 413297671d468fca6c5802d4df3707ee SHA-1: 11fb86e200467a7f6971c2398345934dddb6a1cc SHA-256: b708c4db7a14161bba8700ed8fb8a6ec4d5c07939d8ac8ff3e16e382b67b4c33
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector suggests the intent is to lead users to harmful sites.

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://ggtraff.ru/aws?keyword=jackson+high+school+football+score
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/afb317b1cced83.pdf
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/suroruzubenijad-liravigol.pdf
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/bidede-lewubero-memixudasoseset-pufenuluso.pdf
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/8263546.pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/04cab5.pdf
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/ef8787fef2fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/dfe9dae6-2788-43c7-85f5-fe8124423920/64908451386.pdf
    • https://uploads.strikinglycdn.com/files/82ff1ae2-2c20-46ad-b54d-caefac24801d/best_buy_waterford_geek_squad.pdf
    • https://uploads.strikinglycdn.com/files/35d79ac6-f516-4637-b1d7-7e6e0de57073/vusonaxip.pdf
    • https://uploads.strikinglycdn.com/files/bb9c815f-21e2-46f9-886a-f9b194b3e435/zosateradopoludig.pdf
    • https://uploads.strikinglycdn.com/files/882a94d1-ec44-4a98-b7f4-08760fbcff2a/nina_dobrev_agent.pdf
    • https://uploads.strikinglycdn.com/files/baddd4ad-3dd3-4c0d-ba24-7ef5fe847325/fujuzefedurilezuxag.pdf
    • https://uploads.strikinglycdn.com/files/ac719dbd-95e6-4646-adbc-2689e7e6a7aa/50165601386.pdf
    • https://uploads.strikinglycdn.com/files/f4f9cfbc-7866-4377-951e-86f202ec7e70/custom_weapons_starbound.pdf
    • https://uploads.strikinglycdn.com/files/c4650c43-6fa6-4e73-8ec5-63b0e1f9c53a/science_and_practice_of_strength_training_third_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d8.bin
173dc1ccc9d7f4bab732d78dc52096786d14f64bfa3d44f5619f1cda023941f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D8 5124 bytes
font_01_sfnt_off00007931.bin
cc55b86d3c5f83b1b2ac4217c6d8c18c0dd14b63b2ffb9181e55985b691fcd24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 10512 bytes
font_02_sfnt_off00009cf0.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF0 4324 bytes

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