Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca42021d09f3127e…

MALICIOUS

PDF

32.5 KB Created: 2021-07-04 19:40:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d47d3bc8584fb2152dc201d35ca39dff SHA-1: 6097e6371e81ab19de025c4ae5ae29db0d16f6b8 SHA-256: ca42021d09f3127e37d4bd13e3377e8da5deeabed35af753673fa86e74633859
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically for 'free generator / game hack' lures. The document body and embedded URLs reinforce this, pointing to sites offering 'free Robux' or 'Coin Master hacks'. While no scripts were extracted, the primary attack pattern involves social engineering users to click malicious links, likely leading to further malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/431946152/free-free-robux-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/rexgg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/speed-hack-script-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-cheat-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-para-apocalypse-rising-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-other-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-copy-and-paste_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-pet-snacks-in-coin-master_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_001_off00002a93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A93 21968 bytes
SHA-256: dbe3df60d5b486d538d27d2cad2a9184faf70a1e5ffbddf7c741cdd6b47f8de6
font_01_sfnt_off00005b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B48 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

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