Malicious PDF — malware analysis report

Static analysis result for SHA-256 d005f4f4ec6be168…

MALICIOUS

PDF

39.9 KB Created: 2020-11-06 14:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d1b088981a3946e5107ac85332cd442f SHA-1: 8c13034f49025850984bc1313b88ba0fa0bd3bd0 SHA-256: d005f4f4ec6be1686814c7d3f82a719e46cc1899219396173f5033a41e2e471e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious 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://ggtraff.ru/strik?keyword=monster+inc+drawings+cute In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f9685a389911.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/8285e1.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/46819cb8564.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/5143104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fa12af86b2d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f891ff79de39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f8c5fe64614a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2786/8059/files/gedezamusutilijapalel.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/8518552378.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/16655919296.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/66024802627.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/74695401454.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_off00004fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC5 5056 bytes
SHA-256: 292d23f8bd040d29238d91b375fbbb6052e67d470de504d0d1c9df421b6f37c8
font_01_sfnt_off00006119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 10508 bytes
SHA-256: 96a01b2e3f5cbd3141723219d936769e0ae413c86e2900c6b582a7d9def2b47d
font_02_sfnt_off000084ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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