Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c19338a457d2c42…

MALICIOUS

PDF

35.2 KB Created: 2020-10-30 22:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 89b3dc4ee0af25a6032322d446017d94 SHA-1: b2c4444922cd59f2fbfffd11b3eca5432590a35f SHA-256: 6c19338a457d2c42027e114262f9ce7a09c5cd73832436c7b423c4d95f112545
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, forming a link farm. One of these URLs, 'https://ttraff.cc/123?keyword=fill+me+up+chords', is identified as a malicious redirector. The document's structure and the presence of numerous links suggest an attempt to lure users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/123?keyword=fill+me+up+chords In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5f89cbaa09392.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/3951360.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/jexatuvugo.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/metozetepexam.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/d13a6a6db98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tenunud/fexagilowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa042cb-e684-4e1a-a3fb-91a59f01b1e8/65058939055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5933/7621/files/nelewekakojibigaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f5d144-f698-49e9-acfa-0843856dd722/49112167043.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/boxcar_children_movie_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69952f4-5838-42fd-adcb-6b45a1a60f17/vutagijivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34282372-f4cf-4bb4-8ff5-897e07b72dce/7740531893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09986e9b-e62c-4e50-9b24-e790abf58f08/56493622169.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4158 2932 bytes
SHA-256: ca5fedc0fd268006024b70224038003034331c784fddc76ad0f5fb6b7a981404
font_01_sfnt_off00004bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD2 5060 bytes
SHA-256: 3249ee97815470481350f8d220efa604d5147c21249586e50d99e109b85f906f
font_02_sfnt_off00005cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDA 10200 bytes
SHA-256: ed5619f1d9de5c321fe104d204356c4021d69c696354d4c16673e341acb98feb

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