Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4148412e2237fa…

MALICIOUS

PDF

54.9 KB Created: 2021-06-09 15:41:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af6d71dec398afa3f291dfe0ac0fcd9c SHA-1: 7ffeb00184099bb0b0b3052da995d6e946883df8 SHA-256: 3d4148412e2237fae857cf826a779e960f0cce7ed688331bc25f9f3ccfadc347
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary URL identified, https://netcdn.tw/app/431946152/how-to-get-hacks-on-roblox-strucid-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

Heuristics 4

  • 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.
  • 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/how-to-get-hacks-on-roblox-strucid-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/denis-free-robux-app_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-tk-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/tiktok-free-view-like-video_GM835599320.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/escape-prison-roblox-cheats_GM431946152.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_004_off000051c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C5 29872 bytes
SHA-256: 966848fd9949dc825ba5178874182655d77a0e37f082c8c7171122600745daa1
font_01_sfnt_off000097d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D0 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000b29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29F 18884 bytes
SHA-256: e182183cfdf1d43f0c4f633485d697be04ba184033403cfd5219e485a9cdec10

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