Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ab05bf4a6801a4…

MALICIOUS

PDF

33.4 KB Created: 2020-10-29 06:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252da38653349b8625e0a423859480e8 SHA-1: 77dca1e2dffb5338b905d5e897a8f035872196ef SHA-256: 69ab05bf4a6801a438e6b581a22779d61744183eb74001b8d18ccdc8fdace420
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, which in turn leads to a link farm of other PDFs. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on a malicious URL, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.me/123?keyword=corpus+christi+tv+guide+time+warner+cable
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f87bfd0f3177.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5f8cc0e016e97.pdf
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5f96d2a02b02f.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f915358a0673.pdf
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/dususoxepebo-besusa-ruwasuvukedef-jomar.pdf
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/vepiwilukisopujabom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/821a37bb-ac7e-436d-bace-80bb60ee0da6/witch_gear_bdo.pdf
    • https://uploads.strikinglycdn.com/files/710c4670-6234-47af-9b42-821072979bc1/gazegijusevajomimubigefux.pdf
    • https://cdn.shopify.com/s/files/1/0497/4929/5258/files/escada_cherry_in_the_air_discontinued.pdf
    • https://uploads.strikinglycdn.com/files/bc051647-f05b-47e4-84a4-e79e869cbfd7/dt9205a_manual_download.pdf
    • https://uploads.strikinglycdn.com/files/4d8f9e72-4436-4dea-b442-ef979b47848c/franchise_opportunities_in_trinidad.pdf
    • https://uploads.strikinglycdn.com/files/7fb1908a-e386-464a-b029-fc3f256d6303/36401772847.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_off00004324.bin
6e463349dca09e3acf1bd1e50f6a173f032f1a7752a5f284975fb6c458a2edb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4324 5684 bytes
font_01_sfnt_off00005657.bin
65072352abe14b656acb6f71cc642a7d49022fc550622580265b48f8dd4cb3ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5657 10312 bytes