Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b7989b1cbf2f09…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 03:13:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 91bccdbea0e51b284a5b26350e6252e7 SHA-1: 07dbdf688b0a5eba207f5cbd23fd8f75319d2b09 SHA-256: b4b7989b1cbf2f09bc5aece0e5815fe4f8dc5e828c09060b33f9e65eeba4689b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency or hacks, directing users to a known malicious redirector URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links indicate a social engineering attempt to redirect users to potentially harmful content.

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/431946152/free-robux-hack-generator-game-hack In PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-hack-robux-may-2021_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-do-you-use-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/is-pokemon-go-fest-free_GM1094591345.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/hack-for-rpg-world-on-roblox-to-get-money_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/hacks-for-rocitizens-on-roblox_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_off00002f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F79 22248 bytes
SHA-256: bc4fa32ddb4004c575b79e567aea02462592694fed6d62afd86a327a34d7b104
font_01_sfnt_off000060df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 18992 bytes
SHA-256: b99d042f038cb0854217112ff22fa2c67a055dc81878343cfdd53606797f06ab

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