Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b45652ef02ef6e…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 00:03:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 41dfbe4c060d062d54bfe7bed4d1fb3a SHA-1: 2cc240dcbecf4ac3a6dbcbc7a7e6a22e53925938 SHA-256: c8b45652ef02ef6eee008658e42eb1e66c4aa251b155f71893171c5dc0694dda
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links, including one pointing to a 'game hack' generator and others that appear to be part of an SEO link farm. The document body, though partially garbled, contains references to game hacks and generators. The presence of numerous links to external PDF files and a redirector URL suggests an attempt to drive traffic to potentially malicious or spammy content, possibly as a lure for further exploitation or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/479516143/minecraft-servers-that-allow-hacks-game-hack In PDF document text
    • http://karldall.dk/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://karldall.dk/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://karldall.dk/images/freegames911com-coinmastertipsandcheats2021freecoinsandspins_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_off00004afe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFE 25464 bytes
SHA-256: e1cd1897a357192c5ef03904d65b3097e689645b659053566aeeeef201e63207
font_01_sfnt_off000084f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F8 18396 bytes
SHA-256: 9f0f6966d160eb4a8d7c12083ffcfddab2fd99c1ceedc8c822370871be153b2a

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