Malicious PDF — malware analysis report

Static analysis result for SHA-256 1440b68ff8eeda80…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 07:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a8ae4e5f1e9374d88fb5dcac1d4e2f4d SHA-1: 2d4918b29f0a7bc5b07de4e8d1b683c487102a9d SHA-256: 1440b68ff8eeda80ea6b4538fdb277203cee3cff85e0c21e198f7ec9d155bb83
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external websites, including a known malicious redirector, under the guise of free game hacks and generators. The document body and heuristics indicate a lure for SEO manipulation or to redirect users to potentially harmful content. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-rap-lyrics-for-roblox-game-hack In PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-appvaley_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.romento.com/uploaded_files/userfiles/files/all-game-roblox-admin-gui-hack-working_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_004_off000050d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D2 30176 bytes
SHA-256: a60bd537d115d5557730488b4ca66667e92787b633b327b4c33b52ef3f5635ae
font_01_sfnt_off000094b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B3 18652 bytes
SHA-256: 67c309d81cb5bf3ab9efb99c1cf07e137a4e7dba29b05ec1d981d6d202573bf7

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