Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dab9b6b61b30e3…

MALICIOUS

PDF

42.1 KB Created: 2020-10-12 12:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b768f49fc4bd566d23ffba74b0b9f466 SHA-1: f8848b6eb0174b347b21fd5eaf61db49981bb76e SHA-256: 36dab9b6b61b30e3f1f4b54e0e5c793a07ad849633c50cdd53779a139f375456
162 Risk Score

Malware Insights

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

The sample is a PDF containing numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=sony+crackle+apk+2020', which is flagged as malicious. The presence of a link farm and a malicious redirector strongly suggests an attempt to distribute malware or conduct phishing by directing users to harmful sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?keyword=sony+crackle+apk+2020 In PDF document text
    • http://nalumakul.800steps.com/uploads/1/3/0/8/130874030/mufajal-gidadufep-nixunizo-dijarefufafi.pdfIn PDF document text
    • http://files.ecchamilton.ca/uploads/1/3/0/7/130738803/b44360.pdfIn PDF document text
    • http://nupelu.stlinuslions.com/uploads/1/3/0/7/130739978/nebapezanoxum.pdfIn PDF document text
    • http://files.royalsiammoraga.com/uploads/1/3/1/8/131856619/6529768.pdfIn PDF document text
    • http://foruxiv.nicoleadriennecreative.com/uploads/1/3/1/3/131379179/9207985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8218d55-93df-4b5d-8d77-c32cbe313bbf/56406540314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d3a7a3-eed7-4a9b-8d42-494a7dc3d792/zelas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0a118c-b2a9-4377-b8f5-913236c1f818/gemomexugamojari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/90830704151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5724/5081/files/7036149017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2209/3983/files/fugozuxe.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_off00005bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDC 5292 bytes
SHA-256: e2303c82e7a9a84f9afdcd7979391831833ce17d3f2a17bd9fed5983edd24e61
font_01_sfnt_off00006de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 3704 bytes
SHA-256: a30997c041d95837dfd0be30c46fc1d437a007cbdc2ffbe0c6afad36a5542666
font_02_sfnt_off00007917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7917 10128 bytes
SHA-256: 657855c756aba7a39f0bd94de7b4b8fea98582255148732e39ce189fca1be768

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