Malicious PDF — malware analysis report

Static analysis result for SHA-256 837a1d5e018dc294…

MALICIOUS

PDF

46.4 KB Created: 2020-11-03 17:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 69336a870247da60ef8c6bc0f3a33846 SHA-1: 1c856de5314232c080c0174f4e3264818edc67d0 SHA-256: 837a1d5e018dc294c4c637192e2174b2f9ea1cb761b90578209cdc853d5b6ebd
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'smite free skins' and the URL 'https://ttraff.cc/123?keyword=smite+free+skins', suggesting a lure to a potentially malicious site.

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.cc/123?keyword=smite+free+skins In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f9631074e59b.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/3373854.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/wuniku/haryana_hssc_clerk_answer_key_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/2755406494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86162b9d-0e4a-4484-9730-70424de71647/35668789808.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7149/0198/files/future_perfect_continuous_tense_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gisesot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8929/2184/files/kujemodiwumunesitugis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66d94e4-9e04-4c5a-b0c6-41fd3c77b84d/gasekub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1742cb4c-ad7f-4fdb-ae9c-e09e57d2c303/83850751446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bf0ea3-98c4-4793-9b4f-af91a4eb9279/lebron_james_letter_to_cleveland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1057689d-630c-49c2-874a-234fac13fac1/wivonoxiron.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/rajinaxosotebego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07921c75-def2-49a7-a3aa-f3c4eb1b64a3/16588277537.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/auditoria_forense_en_bolivia.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7735 4836 bytes
SHA-256: 746eda73f3f37c309cb897ae377bcf289ee1c57418d5d2421686525eddb64677
font_01_sfnt_off0000879b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879B 10940 bytes
SHA-256: 47dc2d06bf391281f30366db75b18d7d6b5742502b581d6ba10cda499a0e29d5

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