Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2523f2f39ab2e67…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 03:29:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fc1dde97cd0e8ee337bc7384d2d70af1 SHA-1: ebb2d2a6cc5c3239041f329f73bd1d9fd05ad225 SHA-256: f2523f2f39ab2e6799c13baa19dea9c9f7577c8ac74c20c2d43d80cad73f78a7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are identified as malicious redirectors or part of a link farm designed to lure users with promises of game hacks and free currency. The document body and embedded links suggest a social engineering tactic to drive traffic to these sites, likely for further malware delivery or phishing. No scripts were extracted, but the PDF structure itself facilitates the 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-education-edition-free-game-hack In PDF document text
    • http://razredna-nastava.net/files/viper-venom-hack-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-cheat-engine-no-viruses_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/izuku-midoriya-roblox-free-shop-t-schirts_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/pubg-uc-digi_GM1330123889.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/dll-hack-scripts-roblox-strucid_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/royale-high-hack-club-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-minecoins_GM479516143.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_off000030c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C9 22284 bytes
SHA-256: abb02b956b67e4062343e195b316511c1fb85cb5750335320fc029770f401bd2
font_01_sfnt_off000061ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 18312 bytes
SHA-256: 08598633ecdc94b382a4e335ccefc5a7b6d358a9bcaaad09a03ae0d079369349

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