Malicious PDF — malware analysis report

Static analysis result for SHA-256 840b8e078e83aceb…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 23:07:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f8111eb408106006daa505d73413816e SHA-1: ba9a384fcdc6f2ac8b17ae8cd5e7d753d7527118 SHA-256: 840b8e078e83aceb9950777e7280b827fd667146c847310b42c644f965fcbeef
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'free generators' and 'game hacks'. The primary malicious URL identified is http://netcdn.tw/app/835599320/tiktok-free-update-game-hack, which is known to host malicious content. The document body, though partially corrupted, also contains this URL and other links that appear to be part of a phishing or scam campaign.

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/835599320/tiktok-free-update-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-hack-someones-acc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-cheats-for-jailbreack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/pokemon-go-free-and-pokeball-plus_GM1094591345.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-builders-club-in-roblox-ipad_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/buy-free-robux-roblox-girl-skins_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/gamekit-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/new-roblox-logo-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-t-shirts-on-roblox_GM431946152.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
font_00_sfnt_off0000331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331E 23144 bytes
SHA-256: d532160644a8f47a79a63fd1045fff62a9e87966cdc5245b7f4c53e010910582
font_01_sfnt_off00006746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 18508 bytes
SHA-256: 2341ecbc9f3fc026d1b22b4fd32b9a14e9e45282f59e0d0857d01898b253e090

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