Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cfdf8d59af2a83…

MALICIOUS

PDF

50.1 KB Created: 2020-10-28 11:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217aff4f1d4f9fde1ad773b535391a20 SHA-1: 1547ca2aea838abce74f3008bfd936bcef24258d SHA-256: c2cfdf8d59af2a83a4a4e00d969c0bdff875da2cb4eccbd4357703f380a19f44
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result, which redirects to a malicious URL. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a deceptive lure. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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/123?keyword=tenor+sax+scales+for+beginners
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f946a2adcdf8.pdf
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f97528303f42.pdf
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f8bd2770f536.pdf
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5f990af015c3a.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8afb92d9f5a.pdf
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8c53d9aa312.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8754e28d5aa.pdf
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8d994c4fccb.pdf
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f91fdc29a3c0.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f88f7f3a7173.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f871c6041b1c.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5f944c829f87c.pdf
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f884e2da5e0d.pdf
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5f90a7c4f0e72.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5f95fc57669f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/gebotuxugan.pdf
    • https://cdn.shopify.com/s/files/1/0493/6666/3327/files/8.1_identifying_dna_as_the_genetic_material_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0501/6875/8453/files/vomurekekazanoj.pdf
    • https://uploads.strikinglycdn.com/files/db315fe7-a3ba-4bdd-88a9-20eb2e38ef8b/dunkin_donuts_blueberry_bagel_calories.pdf
    • https://uploads.strikinglycdn.com/files/03790791-2cdf-49b3-b201-31090d47af05/26879775902.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3142/files/nubunilaropeg.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_off0000848b.bin
7e8ebd5358fe300d65f6432db2665bb5c5d912f736b6865018a0574f4fe78fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848B 5204 bytes
font_01_sfnt_off00009654.bin
fdc7e084e41b111bf50f9914ba6c9a5a37f8319c21545c0e3834bd70fd1c228a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9654 10564 bytes

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