Malicious PDF — malware analysis report

Static analysis result for SHA-256 f859a3b39393eaea…

MALICIOUS

PDF

43.2 KB Created: 2020-10-06 19:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3474b298b00546472a25d337e214e3d8 SHA-1: f5ee1ea93aa9b3f8067ba2a04b84197edf077de3 SHA-256: f859a3b39393eaeaf2ca6d525124f6b2df8c339a85bb34dc0517f93558113bca
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and other links that appear to be part of a link farm designed to attract traffic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF 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://gettraff.ru/strik?keyword=danganronpa+episode+3+google+drive In PDF document text
    • http://files.edinaseniorpartyflowers.com/uploads/1/3/1/4/131437941/sitesupax.pdfIn PDF document text
    • http://vagebaf.thedevilskaiju.com/uploads/1/3/1/3/131398140/kubonatevaja.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/1/0433/4475/6901/files/chapter_20_study_guide_static_electricity_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1862/8505/files/79523078981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1043/2930/files/xalovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0323/1646/files/71751309634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5029/4171/files/mtga_season_rewards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fd428a-2bf6-4fc9-9045-1d72c51cb1cf/mixir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807b9878-e2ee-4d72-91b7-8fb5796163f7/roruvurivavoxuxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3542b114-47f3-48d9-8422-6280942d9c53/rejixamix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a7b6be-80ff-4d2a-9bba-f8528fa9774d/85154112996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb259f9f-0833-48f5-8ed9-a26f72993610/mugusisakomego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d786cf9-2292-49d5-a856-d709d35e4171/98396162257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662155a4-4cec-46e9-b2ad-87b2c1320b92/10808926881.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_off000068c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C5 5348 bytes
SHA-256: 80d33d55275af1e508db9499c6081a49134cb1280132c06551bbc325ee405ef3
font_01_sfnt_off00007b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B14 10844 bytes
SHA-256: 97aa6d7227d3992969a964acedb96b3f2c630acbbcac332b47db3adc3019c7b0

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