Malicious PDF — malware analysis report

Static analysis result for SHA-256 e605591e5580c95d…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 02:30:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9d6285aae50771988042efd23f825adb SHA-1: 42262d91f3faa1db3103592498977566f76e7171 SHA-256: e605591e5580c95dd4aa1b23fad323c7e73aeaf2cf70f18319eef7617790f446
180 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to known malicious redirector infrastructure, specifically advertising a "free generator / game hack". The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the lure suggest an attempt to redirect users to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.tw/app/431946152/free-roblox-card-generator-game-hack In PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-fandom_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cheat-codes-in-work-out-simulator-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-facebook_GM406889139.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_off0000511d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x511D 26204 bytes
SHA-256: 07b6e4fc82f3c9594ea360b775b5e8de53d75a5bf1b8a3467daa0817ad4ba469
font_01_sfnt_off00008e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6C 18456 bytes
SHA-256: f88e7f36c8e40c3851beaaccf8fede8880ef1ed63c7072abb9e7a3f66c81ad84

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