Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc709cf7376c9d37…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 23:23:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2022a6a17541651580f244cf331cbf49 SHA-1: 5085b4913bd7ed2ba6f82bd24915ef8ef4f31892 SHA-256: bc709cf7376c9d37993904ab7c25c1b4b92e2bb334db9936ee491f59bfd44ce1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and generators, directing users to a malicious redirector URL. The redirector, in turn, serves further malicious PDFs, indicating a multi-stage download or phishing campaign. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-hack-mod-apk-2021-game-hack In PDF document text
    • https://mbbs.hr/files/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-roblox-autokill_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-shirt-adidas-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-shirt-templates-2021-christmas_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-royale-high-hack-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/get-tons-of-robux-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/2-gunda-parte-del-hack-de-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-without-buying-it_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-is-gay_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-how-to-protect-your-free-model-from-being-copied_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-change-your-username-on-roblox-free-2021_GM431946152.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
font_00_sfnt_off000030b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B5 23028 bytes
SHA-256: 1d2b820c25c5f7443f8f4167dbf2b43836750ae2c342064dcfd469f872d0640e
font_01_sfnt_off0000646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 18756 bytes
SHA-256: a597e2a1a6313d69caaefc0fd9e6b3b52d3816ecea07cbaeac835cf7e101dd2a

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