Malicious PDF — malware analysis report

Static analysis result for SHA-256 43080ad16dfbef4c…

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 00:27:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4425dcb29528ff66aaef086c13a54d9b SHA-1: d4e5ed35a65fb88c3cb2fedf9aeef0704e6c91ac SHA-256: 43080ad16dfbef4c640c50c70a1138c5d54600f98ddccfdc51b1341af2cb7508
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and generators. The document body, though partially corrupted, contains references to 'Coin Master Free Spins' and a URL that aligns with the heuristic findings. 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 0.9865

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.online/app/406889139/coin-master-free-spins-11-01-2021-game-hack In PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-spin-hack-pc_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_off000053b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B1 25280 bytes
SHA-256: 55b51919bdf21b13631b46b75803a403d50e94d19cb4f83c615ffbfcec18c84a
font_01_sfnt_off00008c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C88 18288 bytes
SHA-256: 24895b65f98328fb27e7c69f6686c9deb14e0c1b0b62a883e5ab50589681f060

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