Malicious PDF — malware analysis report

Static analysis result for SHA-256 2721d64b8a7c2215…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 10:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 596c95aeeb95a87aab1ba6f6e0a5764d SHA-1: 8b2a5cac25157f54e70bdeca86d2980ad3d68283 SHA-256: 2721d64b8a7c221561c6fdd528055db0e1b3cb675837b281d0ec0a61770ea769
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to websites offering "game hacks" and "free spins" for popular games like Coin Master and Roblox. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spin-software-game-hack, is flagged as a malicious redirector. The presence of these lures and the malicious redirector strongly suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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-spin-software-game-hack In PDF document text
    • http://library.umla.ac.id//repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-money-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-hack-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-royale-high-school-diamond-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/mathep_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tiktok-free-ebooks_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-hack-2021-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-viral-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-giveaway_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_off000032be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32BE 22336 bytes
SHA-256: 97e157261df9e4971bebe2d5599435fade10480683a06316684ad3e9bf38bddd
font_01_sfnt_off0000647c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 18336 bytes
SHA-256: fa42da4ea5b257e26b112186455cee4d5782166d8fa63482065da249d93c9a49

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