Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd369833d96fe2e…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 06:26:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 33f428df6fa1074ca4b09281a1112d66 SHA-1: 55bc0e983078091b16825503f980bf825a4d909a SHA-256: 8dd369833d96fe2ef36f6dacfa345905b858399b79f5e9dfa1847f236d25567d
180 Risk Score

Malware Insights

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

This PDF document contains a malformed stream and links to known malicious redirectors, specifically advertising a "free generator / game hack". The primary URL, https://netcdn.tw/app/431946152/hack-initiate-unlimited-free-robux-40m--game-hack, is designed to lure users into downloading further malicious content or engaging in phishing activities. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/hack-initiate-unlimited-free-robux-40m--game-hack In PDF document text
    • https://mbbs.hr/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/tiktok-free-steam-games_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-links-blogger_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_004_off00005065.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5065 26592 bytes
SHA-256: 759cf4e911e70a2d6d4bc24985ee94e9c50464e1f0b3b578a5ac58e20b8cd77f
font_01_sfnt_off00008e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E61 19564 bytes
SHA-256: 39aae70be2258e4f7c664005a4a83513f86c280bda3f4d94c9c15dec66c20a2a

Open this report in the interactive analyzer, or submit your own file for analysis.