Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f6a7e6396edc0a…

MALICIOUS

PDF

35.8 KB Created: 2021-07-03 23:33:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 72a64af4e770a1d8f782b23a3c517984 SHA-1: 5be5b3572ba4b124820aad1401ad868eda8cda69 SHA-256: c4f6a7e6396edc0aa22b4ae6f1ca0af26971d80a51e188fbae4af464146b89c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that lure users with promises of free game currency or hacks. The primary link, http://netcdn.tw/app/431946152/free-robux-no-human-verification-or-survey-game-hack, is associated with known malicious infrastructure. The document body and heuristics suggest a social engineering tactic to drive traffic to potentially harmful sites, likely as 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/431946152/free-robux-no-human-verification-or-survey-game-hack In PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/how-to-be-a-hacker-in-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/can-i-get-free-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/hack-robux-2021-inspect-element_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/commande-lua-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/pokemon-go-free-vpn-android_GM1094591345.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/how-to-make-a-group-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.kbmmtsn1kabserang.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-35-8_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_002_off00003135.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3135 23184 bytes
SHA-256: 4d617eeed7294795524cd03fe586d8ab0d02f295d0229e7c58b174082a5c4c4a
font_01_sfnt_off0000655e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 19628 bytes
SHA-256: cb05efb9b877c2f5ac358f74233e4765df12f9300101f4d7656cf4ee8e1f887a

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