Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bd121de5e138c6…

MALICIOUS

PDF

47.6 KB Created: 2020-10-30 06:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 05acf6b6d8fa3720fcad97f7ae0d8b60 SHA-1: 06096db9ef11a2110e3dce43a00167bb225e9212 SHA-256: 84bd121de5e138c617367870b5ba35d71e48a40d03a2b41e9582929ec7c04a57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to search queries and references to external PDF documents, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is designed to redirect 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://ttraff.link/123?keyword=lifetime+fitness+south+austin+class+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8f084a7d4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f922ea154c81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7439/0678/files/playstation_3_cech-2020a_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba29769-a817-4be0-945b-ffd3d88daabc/62545965213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c464f0d-9696-4a83-bef8-4a3116363d31/70866656307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa2b89e-a2fd-48df-aa5a-1a648e7db8c4/vovedakilubabux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d42f0e-8153-481f-9f24-74346fb5e768/35775658003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3160/8487/files/tps_4000_fronius.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/9063/3415/files/92769121891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dea74c6-d990-4077-ae18-9813e917b59a/bigopakanakid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5382/4677/files/19301931985.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/24724690711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3978/3584/files/hype_smart_watch_how_to_turn_on.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6812 5108 bytes
SHA-256: 3da8f6131410e8ba893cdd73b8f27ca1f00b951f9ef5adfffa3354cd4d51e770
font_01_sfnt_off00007955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 10084 bytes
SHA-256: e040ecc8e992af3cd0f46294ea549926aba82b9c660302e3431afd6dc063648d
font_02_sfnt_off00009c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0E 16176 bytes
SHA-256: ec9986929bb8e82e8659f3ce4caa92260035ff1cb75e76a0e0d57d8883caacd9

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