Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b7b077729f8545…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 03:56:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aeaac9adcf3bb56aea42830ce69c40c3 SHA-1: 097c510fed6dddccb2972fc431782603c506a3de SHA-256: e1b7b077729f8545f82dbe022a623cc517a9eadd23feb978003a301f34704fa5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and SEO-optimized PDF files, all related to game hacks and free in-game currency. The primary lure appears to be a 'free generator / game hack' for Minecraft, directing users to http://netcdn.tw/app/479516143/minecraft-hack-client-download-game-hack. This indicates a social engineering tactic to drive traffic to potentially malicious sites or downloaders. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-hack-client-download-game-hack In PDF document text
    • https://tpp.com.tw/image/data/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/games-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-free-money-on-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-free-robuxs-by-surveys_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/earn-roblox_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-grand-continental-railways-free_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/free-roblox-clothes-codes-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/roblox-booga-booga-cheat-duplication_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://tpp.com.tw/image/data/files/coin-master-attack-madness-hack_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
font_00_sfnt_off00003114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3114 21232 bytes
SHA-256: 4939241108c5950b7f342d0d81528dc15724d16d41d00204d2815a72eb2c72ea
font_01_sfnt_off00005f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F33 18748 bytes
SHA-256: c45ee2d1dd43e8513d66b509938ceb122ec1fdfa533c8cde096dea51f38d5c86

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