Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac140b2b0c0f1421…

MALICIOUS

PDF

44.4 KB Created: 2021-05-12 18:05:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 31ed0d48ec0e18348c8ff24771480399 SHA-1: ebdee5e140bd1b32665ac1a3e014cda316e25093 SHA-256: ac140b2b0c0f14219a04d1e75e4def4549db287bb281195793ec8e98b397b289
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with one prominent URL identified as a malicious redirector. The document body explicitly mentions 'Free Cheat Codes For Coin Master' and includes a call-to-action phrase, indicating a lure for potentially unwanted or malicious downloads. The presence of embedded URLs and the nature of the lures suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/free-cheat-codes-for-coin-master-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A31 24380 bytes
SHA-256: 0a4f285486f4d5e667cb7ba15f0948cebaa15284ab8296b50f24ab48856021d3
font_01_sfnt_off000081ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BA 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD3 18052 bytes
SHA-256: 9f7c336b46bb1f5c4c699c2d489464edf46c0e280b3a3f852c1bdf3bee9ca033

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