Malicious PDF — malware analysis report

Static analysis result for SHA-256 540d4a4afa7dcdd7…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 13:43:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: caada398afa7151d1359afcf407ffa93 SHA-1: 10b5beda4a809ebcd35f84bebe8c2332b1ed4e30 SHA-256: 540d4a4afa7dcdd758348bf07cf5d9e14850542e939a680b85c320294dce9a24
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and heuristic firings indicate a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/game-cards-roblox-free-game-hack In PDF document text
    • http://force-seniorklub.dk/images/pokemon-go-free-friends_GM1094591345.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/games-for-robux_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/robux-hack-website_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-hack-accounts-on-roblox-easy-method_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/dis666-roblox-hack_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/lumber-tycoon-money-hack-roblox-2021-february_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://force-seniorklub.dk/images/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005119.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5119 25872 bytes
SHA-256: 9f7401119c168ca742025a4daf5350eae93cd554bfa7cce44a17a6b3151f4a89
font_01_sfnt_off00008d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D27 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9712 18612 bytes
SHA-256: e69c45326ed2dc35957147663a939bfe7a897c8a84a0e4edc8f6ddaa8dc3d883

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