Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c86278e10709d83…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 15:24:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 122600cd90c86599422fb509da8fc6bc SHA-1: 4356462c04881944924f62a9f6fb31634364ac5e SHA-256: 5c86278e10709d838e7ed94bff3da54fd6f5d4ce0c255de7222e13238c6f476c
180 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors and directly hosted PDF files, likely intended to trick users into downloading malware disguised as game hacks or cheats. The document body explicitly contains URLs that are also listed as IOCs, reinforcing the malicious intent. No scripts were extracted from this sample, but the embedded URLs and heuristic firings strongly indicate a drive-by download or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/406889139/free-spins-for-coin-master-hack-game-hack In PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-swearing-hack_GM431946152.pdfPDF link annotation
    • http://110.232.83.89/slimsppks/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-earn-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-hack-generator-secret_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-be-a-hacker-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-hack-without-verification_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_off000030f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F7 23372 bytes
SHA-256: f13150f19c89f01340a8eeae1073c847e7b95468e7a0cba79b0a8ff713a06f0b
font_01_sfnt_off000065c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C6 18344 bytes
SHA-256: 1b9c2ef9418efdd4f31bdac1407ea9f2d903a284f26a3d935c42a711d8cabc04

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