Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6085a33b648fbe…

MALICIOUS

PDF

85.4 KB Created: 2020-10-08 12:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 829fd9c1a64e6ee9006ac056031232f8 SHA-1: ec10d62b06cc2bb7b3c3ad92514e604c65ac6d9b SHA-256: cd6085a33b648fbeb0f06db75e380ea12464cecf279f31d55a160572229dedd3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, cctraff.ru, which is disguised as a free legal aid topic. This indicates a phishing or malware distribution attempt. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm used for SEO poisoning or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=auxilio+judicial+temario+pdf+gratis In PDF document text
    • http://files.operschlosshallwyl.ch/uploads/1/3/1/4/131437864/fogodet_zemiwuwarem_dakete.pdfIn PDF document text
    • http://files.islandartandscreenprinting.com/uploads/1/3/2/7/132710677/2079890.pdfIn PDF document text
    • http://files.newmetestimony.com/uploads/1/3/1/6/131636954/tiwixow.pdfIn PDF document text
    • http://fogirizax.mitchadvent.com/uploads/1/3/1/6/131637046/tajujisokifa_gojedomobeke.pdfIn PDF document text
    • http://pusor.golfclashusa.com/uploads/1/3/1/4/131454766/wopezet_mexufira_matokemizawuxit_jovenebugozu.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/1/0484/0095/7600/files/tcf_credit_card_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0809/7944/files/soul_winning_tl_osborn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0200/3108/files/heat_of_solution_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0839/2867/files/airtel_data_plans_4g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c02c7f-fa52-4f92-815a-e782d1a18562/xugiwokek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5326d1-b18b-4307-a343-6c37881ca2b7/dopabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5316/2394/files/44703671799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/84127772749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1406/0702/files/forami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/6117387741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/vujugudakut.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_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 5608 bytes
SHA-256: 2f9d2b0c87370098a88f5a663955d520c28bcbea3e6a2d23c23ea936c1dc0880
font_01_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 11808 bytes
SHA-256: 0d96f01a4a72aa9e0711d425c80de0680fe7c725df78ee08c82bcdda0359a263

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