Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b2b23fc95fde73…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 17:09:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f8d522c292b0cfb30a30228dc2c70f36 SHA-1: ef74a02c60a9c82d0105165a0e52f8571eeaf784 SHA-256: 36b2b23fc95fde7379a00e2a2df477d1bf35d8c76af1879c8aa2c4e79cafd68c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or free generators. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to direct the user to a malicious site, likely for further exploitation or credential harvesting.

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/406889139/daily-free-spins-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-usernames_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/broken-bones-iv-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-shirt-maker-online-free-shipping_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-scythe-script-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-build-sims-4-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-robux-and-builders-club-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-martial-arts-bo-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-advanced-placing-in-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.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_002_off0000331a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331A 22976 bytes
SHA-256: 31d83b38a1654184ee0f87a1b13215e10481b0243400c8fea6c629b5d3e4a9ce
font_01_sfnt_off000066e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E2 18348 bytes
SHA-256: 1a36946a0cb75cea73d2a4e26e89845c8e7c06408ba3f54c43b6c58b563cb802

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