Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf85c8987def310…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 17:10:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c30f1892540f47ffcfbc0d1ecf7832fc SHA-1: 2b4907984599628c935a6869eaf79c6549eecaf6 SHA-256: 2cf85c8987def3107178dc1b95944a5748443d7c14dc21c486d4afb7e03b052c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links that redirect to a malicious domain, masquerading as a generator for free in-game currency. The heuristic firings indicate the PDF is designed to lure users to malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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/real-free-robux-generator-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-codes-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-ultimte-gamer-365_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-cards-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-no-inspecting-hacks-or-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/elemental-battlegrouds-roblox-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-swat-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-shirt-id-free-shipping_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-hair-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-august-16-v20-7_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_off00003154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3154 22636 bytes
SHA-256: 69742ea17623f2c0f8f7c24d6b5be72322a0e1745a0d0219cfffa7390846c9e5
font_01_sfnt_off000063e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 18896 bytes
SHA-256: 7d09d8ebe20d9048014fae4c420031d848702cb5d655c08a08acd3bd87a1ba6a

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