Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9c63127a4b2bad…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 23:00:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 83345b336da95e3fd28afb1acdc3771a SHA-1: 4ca377aa8f3ec9ce9a4dd10b9ef1bd45bfa8bc47 SHA-256: 5d9c63127a4b2bad965442f6922597d98dfb813f5aae73c4cba9e4bd591136bd
240 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users to websites offering 'free Robux' or 'game hacks', which are known malicious redirectors. The document body and heuristics indicate a phishing or scam attempt, likely to lead users to further malicious content or exploit kits. No scripts were extracted, but the embedded URLs and PDF structure strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/431946152/free-robux-no-verification-2021-game-hack In PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C3 25084 bytes
SHA-256: 539a7f723771d3a1031c45f92063115e1e7a14da43729277c5679ce554d1466f
font_01_sfnt_off0000821f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821F 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00008ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC7 19004 bytes
SHA-256: d712ae43aec968503a6d4b8ef93db90b07e4d7d9799b66e9787cf09d99ae12e2

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