Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad283ba31f276ba3…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 16:11:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bb7f9d57646447eb487e4437b210c3b7 SHA-1: 41c6238ac26cb51c65c53a3a86e0fe5b3cd8bdde SHA-256: ad283ba31f276ba30e18db3a2e4e33f3b52a11e204f1a1af5fbefcc0fcce5621
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a redirector URL, which is flagged as malicious and associated with game hack lures. The document body explicitly mentions 'Daily Free Coin And Spin Link For Coin Master' and includes the malicious URL, indicating a phishing attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the overall pattern suggests a social engineering lure to drive traffic to malicious infrastructure.

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/daily-free-coin-and-spin-link-for-coin-master-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pokemon-go-free-zangoose_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacks-roblox-infinete-jump_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-hair-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-shields-coin-master_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_off00002f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F89 22412 bytes
SHA-256: bea1f405278fb88be3c53ca50e74e5b5df26a5a6f5bd0584cf255aaae3ba512a
font_01_sfnt_off00006186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6186 18940 bytes
SHA-256: f71fab76f9b711b039f2a5799e9a95f719dae13b70802cf3d13ad63cbd86c9d5

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