Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf38aebf5f755ce…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 23:50:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6227da2a329ca69167c10072814bfb45 SHA-1: 8ae33d6b98f1b5d19402e8e8df42f4af6bc1198c SHA-256: acf38aebf5f755ce2b4cdebc4fd20b1aaad5ff0749be0e0ad8a5a27c86379dc7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically targeting users interested in game hacks and generators. The embedded URLs, including the primary one found in the document body, point to known malicious infrastructure. While no scripts were extracted, the nature of the lure suggests the intent is to redirect the user to a site that may host further malicious content or attempt social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/how-to-change-my-name-in-roblox-for-free-game-hack In PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-tiktok-followers-and-likes-no-human-verification_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/pokemon-go-free-roam_GM1094591345.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/why-does-it-say-roblox-hacks-are-virus_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
stream_004_off0000514d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x514D 25336 bytes
SHA-256: 529ec3f9e8e5bc3ec2510347041d009bd83d0506831d40af4dfe54d6f2cddeb6
font_01_sfnt_off00008b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0D 19432 bytes
SHA-256: 9c8f2f220d27c8a4447694f113a65be3887b3a3855d43539c9b0293c5c23184d

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