Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4d74115f8e9a17…

MALICIOUS

PDF

32.2 KB Created: 2021-08-05 05:28:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c7b41a4e45fb4f397c49205108731ff SHA-1: 35043b063169deeeef050c021677ee63e5a664b6 SHA-256: bc4d74115f8e9a173572e79b8538423bec8d6f1b09aa62b7922b4508bed64b50
160 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one that redirects to known malicious infrastructure. The document body and embedded links suggest a lure for free Robux or game hacks, which is a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/roblox-com-free-robux-game-hack In PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://elearning.maddikanang.sch.id/__statics/gudangsoal/files/free-100-robux_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_off00002963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2963 22424 bytes
SHA-256: 81604921726f01528fe771cd07fcd7d518580bff6fbf9579786c8779693f38f0
font_01_sfnt_off00005b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4A 18536 bytes
SHA-256: 8bd8f79a3d85335837704a41a1f8010889ce781331cd4cec55e8058680d5a9b8

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