Malicious PDF — malware analysis report

Static analysis result for SHA-256 e778bd54f2185dfb…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 22:16:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7bb0b061eb31f3cbb3cf13f10d6f0073 SHA-1: 2d6abdfaf8552a49b396c902d25272d2524f0a84 SHA-256: e778bd54f2185dfb5241658281de8b6a3a10d8be7c379f1f6a9eb1b17bbcd56a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and generators. The document body, though partially corrupted, contains a URL that aligns with these findings. The primary attack vector appears to be social engineering through deceptive links within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/how-to-get-free-minecraft-windows-10-game-hack In PDF document text
    • http://gremihostaleria.cat/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://gremihostaleria.cat/images/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://gremihostaleria.cat/images/coin-master_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://gremihostaleria.cat/images/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gremihostaleria.cat/images/free-spins-coin-master-links_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_off00004b81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B81 25588 bytes
SHA-256: 82509cea2d81d595061f2bcdbc167f5f53c384c7ddffd9931e711066143cfb06
font_01_sfnt_off00008519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8519 18524 bytes
SHA-256: fe6ad3553d22b3ca012de373afe6f753a0e0722d907aa022396de61a87271ffc

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