Malicious PDF — malware analysis report

Static analysis result for SHA-256 1326d78b4038d118…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 00:26:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ef311f42753eedcb37308663f6c3cb39 SHA-1: ce26c72a96085fdc79acec73144f9d0027aea558 SHA-256: 1326d78b4038d118922751bda247162db8e89399b28cedea07c6413c668c7520
160 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a game hack redirector lure, directing users to the URL http://netcdn.tw/app/406889139/coin-master-free-spons-apk-2021-game-hack. This URL is also flagged as malicious infrastructure. The document body contains similar URLs, reinforcing the lure to download or access game-related cheats. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/coin-master-free-spons-apk-2021-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-and-tix-no-download-or-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-girls-clothing-cheats_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/ive-been-hacked-on-roblox-what-now_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-spins-on-coin-master-without-waiting_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
stream_002_off000031ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CE 23288 bytes
SHA-256: cebef385b51fe3d10422705671ffad0663d0dd46e46162b1ef26bb8ca864904b
font_01_sfnt_off0000663f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 18748 bytes
SHA-256: 5e77ef61f71b9edceb1db79b59856649b40968d05cf737e8f2ff8c48d385844d

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