Malicious PDF — malware analysis report

Static analysis result for SHA-256 faff07342e49cbc9…

MALICIOUS

PDF

47.4 KB Created: 2021-06-10 11:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b0ac0bcba0a5ddd72c2bad01cf60e32 SHA-1: ed0403b2e68829ced45f78571e39452bc6135892 SHA-256: faff07342e49cbc90aac9d9e14c0ab65513e43f446e3fd176634e321ba2a30f9
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 0.9832

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 https://netcdn.tw/app/431946152/free-roblox-vip-login-game-hack PDF link annotation
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-royale-high-school-script-get-free-dimonds_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/freed-plugin-roblox_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-hack-100-real-no-fake_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/get-a-robux-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-roblox-login-password_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-hack-roblox-jailbreak-2021-mod-menu_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-hack-v414_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-win-free-robux-on-chest-open-in-roblox_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/hack-roblox-2021-febuary_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/cheat-engine-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/codes-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/free-roblox-items-from-youtubers-2021_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-get-free-stuff-on-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/flippy-hacking-people-roblox_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-do-you-make-a-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://sagarirrigation.co.in/wp-content/uploads/fsqm-files/roblox-walk-through-walls-hack-2021_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_off00005102.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5102 29972 bytes
SHA-256: e3d34b776d975334387ff8be5c2be75744c39bd1ed970ae725451b6e2a0afca8
font_01_sfnt_off000095a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A9 18664 bytes
SHA-256: 71f271752f161704b0dc8f06129307e10be3ed8d1fcfd40b982c0081853f5fc1

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