Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31250cd9a77046e…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 06:45:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8b80e86ae91d486c77a5213aa8eeed8f SHA-1: c2cd3d388e261d91505cb562216ea74fec17269a SHA-256: b31250cd9a77046e454b171d7e0d9b1f6a3ece8ba7aba9c341ba7ae30d5c8af6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as lures for game hacks and free currency. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of a malicious workflow.

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-do-you-get-free-robux-on-a-samsung-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/no-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-play-bloxburg-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-cheat-free_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
stream_004_off00004ebf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EBF 27448 bytes
SHA-256: eea52c1c9729b3af5ee4176d0b6482ccf775bf084ab722b0ca4f101cd71bfd1e
font_01_sfnt_off00008dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC5 19388 bytes
SHA-256: 237f30665d429c786ee5a2aef5adfa235dd48f25a42f2835083b1672e86f3831

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