Malicious PDF — malware analysis report

Static analysis result for SHA-256 29152f8a25424189…

MALICIOUS

PDF

39.9 KB Created: 2021-05-10 21:15:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b7e8ff619ba239925aa091044b720090 SHA-1: 1ffbc2b42a5f3a14d423657433dfacc965882cdc SHA-256: 29152f8a254241895166c6625d2d9a9d34f53f039b6de8c6000d3671a945aaaf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' for games like Coin Master and Roblox. The primary lure URL is https://netcdn.xyz/app/406889139/app-for-free-spins-on-coin-master-game-hack, which is associated with a high-risk score. The document body, though partially corrupted, also contains this URL and references the 'wkhtmltopdf' application, suggesting it was generated programmatically to host malicious links. The presence of multiple embedded URLs pointing to similar deceptive content indicates a phishing or scam attempt designed to trick users into downloading further malicious files.

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/app-for-free-spins-on-coin-master-game-hack In PDF document text
    • http://arkivthy.dk/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/static-moonactive_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spin-and-coins-links-2021_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_off00004522.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4522 23732 bytes
SHA-256: d557b1a034ea39f3d4541c69ba8d455a5dbb83d4f1bf1274f03bca0cd183d568
font_01_sfnt_off00007ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC9 17884 bytes
SHA-256: dc6c70fafb51a78ef12f4086d2953ccfccc8a264293bd4053977bb356e74e192

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