Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2db312691f3485…

MALICIOUS

PDF

71.7 KB Created: 2020-12-29 22:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4d0255994930d3a56e77ab656d0e2bc SHA-1: 53619891b262c4330939f1bc7c5a8722e148e129 SHA-256: 4d2db312691f348526153fd8ecc8cd23fddb3d277db34d0485128eca655138ec
194 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ggtraff.ru/strik?utm_term=try+not+to+laugh+challenge+extremely+hard+clean'. This URL is likely used to redirect the user to a malicious site for further exploitation. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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?utm_term=try+not+to+laugh+challenge+extremely+hard+clean
    • https://static.s123-cdn-static.com/uploads/4368970/normal_5fe3ac5633978.pdf
    • https://cdn.sqhk.co/goluxewimabu/jgjd8id/35180976093.pdf
    • https://cdn.sqhk.co/denobafopum/giticjg/kifobupiko.pdf
    • https://cdn.sqhk.co/vakiduju/TFV4zec/elite_killer_swat_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fa0ac12571d0.pdf
    • https://cdn.sqhk.co/zupodejadofe/giyhchh/15632600653.pdf
    • https://static.s123-cdn-static.com/uploads/4470380/normal_5fdd349db2c94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kagedatabujo/personality_worksheets_activities.pdf
    • https://s3.amazonaws.com/gelawiweza/20751698159.pdf
    • https://s3.amazonaws.com/tifuwuw/tazifezumopevimodetun.pdf
    • https://s3.amazonaws.com/wujixus/55924213091.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/77561160834.pdf
    • https://s3.amazonaws.com/babetafaperaxov/paliwinivifewevonegak.pdf
    • https://s3.amazonaws.com/piwanisaj/smart_standard_barn_door_instructions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db12.bin
e2af0d2e88f48503c29c0040a6f4a25ffb87506d594e22bb426b2cb1e005bd93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 5296 bytes
font_01_sfnt_off0000ecf4.bin
db5984e36cbd40b64fd541b488f741c55808811c06234050674a456ac2c526f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10588 bytes

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