Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52c6f3504539615…

MALICIOUS

PDF

42.4 KB Created: 2021-05-14 22:03:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ecf320146f21b56c79d260744d20646c SHA-1: bd5cb55e92f7d1759e97413edbd13d7597b9d820 SHA-256: a52c6f3504539615787ece25cd1439e2581e737d4ade4fc5ad08dc2ba9622c2e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a "free generator / game hack" lure. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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/coin-master-hack-apk-july-29-game-hack In PDF document text
    • https://www.apartmanychorvatsko24.cz/images/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/try-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-robux-app_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://www.apartmanychorvatsko24.cz/images/roblox-arsenal-hacks-download_GM431946152.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_off00004a14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A14 24444 bytes
SHA-256: 83bf7d8aa5d95563ae33846056a43f2febbc55b54ec13cabc8639625dc950f7b
font_01_sfnt_off000081c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 18740 bytes
SHA-256: ce865f577d2b91d9fb18a851fe7bf0d574d35b43c9543ad0a826623c00423d0e

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