Malicious PDF — malware analysis report

Static analysis result for SHA-256 15237279a20950c0…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 13:59:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a8a154317af1aecbf5571a163b7fd7d1 SHA-1: e2a7928bafa8b5cd611930ec4330aab7219c1689 SHA-256: 15237279a20950c0b0db05a718e1212f13817e414c1c091fdd0980e2a6478c86
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting game hacks and free currency generators. The primary lure URL is https://netcdn.xyz/app/406889139/how-to-get-free-cards-sets-for-coin-master-game-hack, which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/how-to-get-free-cards-sets-for-coin-master-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/114-hacks_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-windows-10-hacks_GM479516143.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_off00004b19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B19 25676 bytes
SHA-256: 9cc99e1d6f1aee93b8f13a1389ccaae5229af75de94a30f26481b1ae45528b95
font_01_sfnt_off00008563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8563 18048 bytes
SHA-256: 28f75b43f9722380b966cf8b0c528ec574198c6122b1958e13c92a798be1b323

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