Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5b7e8196965788…

MALICIOUS

PDF

47.0 KB Created: 2021-05-13 11:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ea866d76ca9ea3871bc0a93d4f6e84ac SHA-1: c927e97b1cf84988f0ce92b5de3ae639bd26b2d6 SHA-256: 1c5b7e8196965788145e851ec77ecb50db603cd590ee59d355ebb043dc788006
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, suggesting a lure for users interested in game hacks or generators. The heuristic firings indicate the PDF is designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/406889139/coin-and-spin-link-game-hack In PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://www.sovtigaz.ru/f/files/coin-master-hack-xyz-download_GM406889139.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_003_off00004840.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4840 25916 bytes
SHA-256: 12cfca1ca03276b86ce8052281144f100e445c1ed18c27568db1c24a544b8800
font_01_sfnt_off000084f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F5 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off0000970e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970E 17736 bytes
SHA-256: 9fd78c46a16481f8ba83db086433be65d4d5874e7db978b85e0d8aad6b4172bd

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