Malicious PDF — malware analysis report

Static analysis result for SHA-256 436e7631fb34fbdb…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 13:05:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3c3b0541884981ce8deee5e4c3a306a4 SHA-1: d1f55106c10f9d8dcd8da7842dae18da3fb469e0 SHA-256: 436e7631fb34fbdb5229d6b4c7f51e5f5cef369afd10fb2faf9aa1e17a131433
180 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks or free coins. The primary malicious link identified is https://netcdn.online/app/406889139/how-to-get-free-coins-on-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into navigating to malicious sites, potentially leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.online/app/406889139/how-to-get-free-coins-on-coin-master-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CCE 25324 bytes
SHA-256: d33c9ef68694668991605be27619a9e0b70bc055848bc73fe41790d25e270277
font_01_sfnt_off0000879c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879C 2920 bytes
SHA-256: 7866b010ce87c03010c9e9b3012247344950352db6dfa85c109f2de8769dafe0
font_02_sfnt_off000091b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B5 17872 bytes
SHA-256: 51f02da227d0679d4a4cca1b372203100e5a9ff6587b3c267ccf786d3222cbcf

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