Malicious PDF — malware analysis report

Static analysis result for SHA-256 108a5b1462a68bd5…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 04:19:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1cb589fd3384f838f9bc0f57a7276a4a SHA-1: e81f9c07c9268fa2295434a142c6fa89b4530374 SHA-256: 108a5b1462a68bd5b137ea6fd3dbb19e91d7d079242846a40c7c70508c24731e
220 Risk Score

Malware Insights

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

This PDF contains a malicious redirector link disguised as a 'free generator / game hack' lure, impersonating Microsoft. The link directs to http://netcdn.tw/app/431946152/free-roebucks-com-game-hack, which is known malicious infrastructure. The malformed stream length heuristic suggests an attempt to hide exploit code, likely leading to client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/free-roebucks-com-game-hack.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/free-roebucks-com-game-hack In PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-robux-legal-2021_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/ho-to-get-min-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/eroblox-hq-free-robux_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/how-to-hack-in-roblox-any-game_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/roblox-hack-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-follower-bot-roblox_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/coin-free-master_GM406889139.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-roblox-open-groups_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://elma.man2kotakediri.sch.id/__statics/gudangsoal/files/mcpe-master-hack-unlimited-coins-latest-version_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
font_00_sfnt_off000031f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F8 22744 bytes
SHA-256: ab759eb8477830d1a2b598be921fd6b42dfa5345c5a3f69ae14c04cea903c672
font_01_sfnt_off0000652b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 18936 bytes
SHA-256: b2340242e0f706a134ee95089d80a66f4cba946ff070ca77717c3cdb3a8b675a