Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a68b42f4ca8591…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 11:26:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6bad50fb90a004d2f255a0840ee0d5e1 SHA-1: 16d67ee8bca906e05fbed58d8b848a64fe3ef752 SHA-256: 12a68b42f4ca8591d68c1e7ecefc80b55944351c86ca45619258bb8bca4112ac
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/431946152/how-to-hack-a-roblox-account-2021-game-hack PDF link annotation
    • http://www.my-travel.com.hk/upload/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/gear-me-hack-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-recover-roblox-account-that-was-hacked_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/adds-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-free-robux-without-verifying-anything_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/rainbow-orange-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-boy-roblox-blue-hair-com_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
font_00_sfnt_off00002ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF9 22428 bytes
SHA-256: 190eaf6e625d2676caf89e3f5bfa500771e3ed339ebcaf3f9e3d7305ce4d7025
font_01_sfnt_off000061ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AE 19468 bytes
SHA-256: 8490c018c81cc22f14dab8ddf5d074d9e4c4287532f70e565512aa2c5e2164f3