Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4efc18ef80efc9e…

MALICIOUS

PDF

41.6 KB Created: 2021-05-11 07:02:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5c14ba96091750a9da88da45ed2cb1fd SHA-1: 6695de55f2d6a0500e74ec427319d6eece71ebf4 SHA-256: f4efc18ef80efc9e23eebc2e4e40028bcc80661a9e3074c028f6018428a094ef
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users to click on malicious links. The document contains numerous links to redirector infrastructure, including the primary URL 'https://netcdn.xyz/app/406889139/free-google-play-promo-codes-coin-master-game-hack', which is flagged as malicious. The extensive link farm suggests an attempt to manipulate search engine results or distribute malware through various deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-google-play-promo-codes-coin-master-game-hack In PDF document text
    • http://library.acehresearch.org/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/today-free-spin-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_003_off000047d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D9 23940 bytes
SHA-256: 59785c5963c301bf4d07e72e239bb35fdf4ab2faca6748d8f6d26edbd62db5d1
font_01_sfnt_off00007e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E83 18840 bytes
SHA-256: 390da4ab381e5da0f3a1dba4b04518bf56609a6cb8a6a234a2d345ffc47ec2de

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