Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc47756508a5214…

MALICIOUS

PDF

44.0 KB Created: 2021-06-04 02:43:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9dec88503deed9d4f6484770ea4fe71f SHA-1: 47e9b0d47a199f0ccc40a407a16aff877bc15a3c SHA-256: 5bc47756508a52148a470ffb3fa541f72eec1bade232ebd19d9fbe67d185bb88
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The document body and extracted URLs strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.online/app/406889139/free-spin-link-of-coin-master-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/harked-roblox-hack_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
stream_004_off00005136.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5136 24788 bytes
SHA-256: 67fedf6f17a12a31f5c95c6d16265beb78f49f7fafdef9e637b925b60951d8c9
font_01_sfnt_off000089e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E8 18056 bytes
SHA-256: 356c08646bfbef9f69d0ba55babd40c7485a9f64db237320543c80bb2a18a5c5

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