Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20bcfd99a9a8f53…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 23:21:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e9f58a62e5e0e75f130d2172661055c2 SHA-1: 54914381bcfd06232be42096672b1b4ffa3c8ba6 SHA-256: a20bcfd99a9a8f53f4d955c5787c018f6095509933ad650a21fafecf2e9eda96
182 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious content, specifically game hacks. The primary lure is a link to 'learn-how-to-hack-roblox-game-hack'. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to exploit user interest in free game-related content to drive traffic to external sites, which could host malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/learn-how-to-hack-roblox-game-hack PDF link annotation
    • http://digilib.akperkabpurworejo.ac.id//repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-free-account-codes_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/how-to-hack-dino-hunter-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id//repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.akperkabpurworejo.ac.id/repository/free-minecraft-java-edition_GM479516143.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_off000051c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C1 26916 bytes
SHA-256: d859b30cb0e1a80eac1fb3d3da5f89b52ead9b1d6c17776f0d01670e68590e79
font_01_sfnt_off00008e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2D 18344 bytes
SHA-256: b110e3abdbcd5819969f5e191c04e9545aa202099285dc73c0096fcb050ef4f2

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