Malicious PDF — malware analysis report

Static analysis result for SHA-256 985c45b4584ac602…

MALICIOUS

PDF

36.8 KB Created: 2021-07-06 09:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 69124fb2f27698c4dafc2b49a8cd94b6 SHA-1: 5239af266229268cca8e706211b2f1572931e430 SHA-256: 985c45b4584ac602973d96a1c916aace2de3f18446fc75f66feffad9bf4d82f3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and other PDF files, all promoting 'free game hacks' and similar lures. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting malicious sites, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://netcdn.tw/app/431946152/uprobuxcom-free-robux-game-hack In PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-by-oints_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/best-free-roblox-exploit-auto-update_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-bonus_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-code-for-roblox_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-hack-a-roblox-game-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/are-pubg-uc-cheap_GM1330123889.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-no-download-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-speed-race-hack_GM431946152.pdfIn PDF document text
    • https://citramandiribor.com/ckfinder/userfiles/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3697 23184 bytes
SHA-256: b7c00d32963ee22489d86189df5c3588dc657aca7b5c71aa82a2ba1cee12771e
font_01_sfnt_off00006af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF8 19152 bytes
SHA-256: 77e1d77af257f2799f450e4aedc0e1b3eb2c97b8c20e190c5e1e9f2e5b207ac7

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