Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccd7ced5747c470…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 21:11:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dd97d5038a9c77385603325209334479 SHA-1: abd331a2e840a37b87e996e76c33b0d039a5354e SHA-256: fccd7ced5747c47081aa8c3ed63c566286286c1731a06fbefd55ed6e7ac851d2
180 Risk Score

Malware Insights

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

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting the malicious site. The ML classifier strongly indicates maliciousness.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-roebucks-com-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/commen-hacker-booga-clasic-sur-roblox-pc_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hacker-groups-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-free-roblox-generations_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-hack-atms-in-liberty-county-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/fastbucks-me-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-highschool-hack-script-oder_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-do-u-get-free-robuxs-on-mobile_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hack-get-unlimited-gems-and-gold_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/robux-sign_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-backpacking-hack-script_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F2F 22764 bytes
SHA-256: d9399d03c22d14babeb8e347db8e79f377f5941c326997e3a1fe849330d98290
font_01_sfnt_off00006272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 18936 bytes
SHA-256: b2340242e0f706a134ee95089d80a66f4cba946ff070ca77717c3cdb3a8b675a

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