Malicious PDF — malware analysis report

Static analysis result for SHA-256 e781f3435688f2b6…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 04:03:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0b5e112a5fffe9ee2b170db83279e698 SHA-1: fc5901652a148d1808fa495f5d43f80110f46c1e SHA-256: e781f3435688f2b6d54c1fbd1a0cfca0b405df3e7c8a612b194da07d5940963d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game hacks and free currency, aiming to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/roblox-online-free-game-hack In PDF document text
    • http://linens.kiev.ua/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-but_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-cheats-without-verification_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_off000047c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C3 25312 bytes
SHA-256: 3a416f8ce04a11ffd005964f0eaedce55ca08095080e82c6c077c514dc93f876
font_01_sfnt_off00008297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 18068 bytes
SHA-256: 065eb5bea139eaf43a54c15370d64aa119270a6f111c6de0f976a0e20a38860d

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