Malicious PDF — malware analysis report

Static analysis result for SHA-256 277d54b5d2910c58…

MALICIOUS

PDF

40.1 KB Created: 2021-05-19 00:22:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d0e1a02fd0e0a2a6bd3248d4fcc0cd53 SHA-1: 26bbafac76dd58dc388fcea0a75f830a33e5273d SHA-256: 277d54b5d2910c58d0a5f105c982e2054ad684e3ce6ead605457cc9b0073271e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, disguised as download buttons for game hacks and generators. The document body and heuristics indicate a social engineering lure to trick users into installing software or visiting malicious sites. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a malicious workflow, likely leading to further malware download or credential harvesting.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/tiktok-free-apk-download-game-hack In PDF document text
    • http://studio-dentistico-fiume.com/files/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-do-you-get-robux_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_off000044fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44FC 23272 bytes
SHA-256: 1abbd53cbf4e31b1b604de99602f5bbd586310e25ba285dcd28ab71fbd09c9c9
font_01_sfnt_off00007991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7991 18440 bytes
SHA-256: 4a0ca55a738a85790a5837a32fbf5a9dd76efc5f52598b5f6f533652721a60a8

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