Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6645e6cbd4edab…

MALICIOUS

PDF

46.0 KB Created: 2021-06-08 21:05:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1d1a92cb7f8905bec41378781a60da73 SHA-1: 35636fff5ea88b41db665f42e9ddf3bcade7acda SHA-256: 2e6645e6cbd4edab9c2d2ba7500ef16ba9be72452d07664070eeba75a8c514a7
260 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, including one specifically identified as a 'game hack' lure. The document body and heuristics suggest a fake CAPTCHA or verification prompt is used to trick users into clicking these malicious links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • 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.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-free-ss-game-hack In PDF document text
    • https://lib.btkljogja.or.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/what-tiktok-free-movies_GM835599320.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-outfits_GM431946152.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_004_off00004d28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D28 24396 bytes
SHA-256: c5bed189a491e30a75a26f77e2ab2b1986e739fa6c2d21d20a128ba972647ad0
font_01_sfnt_off0000852d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852D 3608 bytes
SHA-256: 608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f
font_02_sfnt_off000091b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B5 17948 bytes
SHA-256: 2bd23dbed8ea27330966e17b4ada2ac6edcd6ab729424149bcca055b24b2bbd2

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