Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a03df9b01f86dad…

MALICIOUS

PDF

68.7 KB Created: 2021-01-05 21:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 50df004ad2a06ef94c9360898e1f47fb SHA-1: 7fdbf1a95b6656baf3e3b9b8cb72f0351c0efbf3 SHA-256: 3a03df9b01f86dad4875a7755eb60e341fe13737131fafd557d92aec1621d242
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://gettraff.ru/aws?utm_term=brother+louie+song+free'. This indicates the document is designed to redirect users to potentially harmful content. Additionally, the presence of a large number of external PDF links suggests a link farm, further supporting the malicious intent of distributing traffic or hosting malicious content. The ML classifier and ClamAV detection strongly corroborate these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=brother+louie+song+free In PDF document text
    • https://cdn.sqhk.co/boxokozofe/gjjebhd/amazon_prime_now_tv_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/Iibdjgu/draw_n_road_80_level_nas_l_gecilir.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jehbGQf/27318407354.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/gdhjMib/65354039116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fcae93451cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/rufigukuj/3xjgY1N/tuletowalimuruzetisira.pdfIn PDF document text
    • https://misaxokur.weebly.com/uploads/1/3/4/3/134354007/1574578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420239/normal_5fcdf2007e9cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fe188bab6c0c.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/gighsge/chronology_time_changes_everything_full_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/KwOiiid/love_stars_happy_balls_brain_puzzle_game_answers.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/vunizi/plural_form_of_criterion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a95a7cc-5a47-478f-884c-b254be819d18/91666712080.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/zusavukawo.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_off0000bfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 2996 bytes
SHA-256: cb80cad7e7b18d910c90453aa3080673d9569d94280362b154d06e9990af2468
font_01_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 4868 bytes
SHA-256: 5113303529e6e7e64f8940ea35f4374a779d8aa692eae9c99d7318f1b1655b0a
font_02_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 15028 bytes
SHA-256: 67db3f638f6be5f0bc5088d6f609ae69ab8bd42d5fa8394cb5356d85743f7964

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