Malicious PDF — malware analysis report

Static analysis result for SHA-256 a159385589b49cd5…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 06:12:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d0661167f644fe68ee5bbb060549d2a SHA-1: a9e5ea1ed1f903fc34fce34d28600a4da7a73398 SHA-256: a159385589b49cd569a60836cfa9b60f3af519e5efe2a1dddcf54c30a04534d0
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/tiktok-comments-free-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/fling-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-for-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-cheat-in-roblox-counter-blox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-bucks-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-a-roblox-account-quick_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/cheats-for-royale-high-school-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-hack-your-roblox-avator_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/rxgate-cf-free-robux-redeem-code_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_002_off00003031.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3031 22848 bytes
SHA-256: 3d73b0395a1491dbe29be67dbe3f92fa4103b00fc49ae4064bd4b522eaefec7d
font_01_sfnt_off0000637a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 18232 bytes
SHA-256: 3f86b0e84a71f4e656adb474880f5ba2a542a6a58af3e80c61055d8ed17e9c8a

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