Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cb1ab856b24181…

MALICIOUS

PDF

46.0 KB Created: 2021-05-17 20:05:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3c38f4a8609e8b44411847beeef96aeb SHA-1: 4916829d72bc6d21f74bffedf50bdacff4e5f845 SHA-256: 13cb1ab856b241813f9fa07160c4231ba8f2cd12404e7d130796d15d68e29966
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file 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 0.9432

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/how-to-get-free-robux-gift-cards-game-hack PDF link annotation
    • http://fobh.net/userfiles/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC5 24732 bytes
SHA-256: 4e91becb399af2e77deecc63311ff12a04af47a6f8a9f7079233e90ca7ad6b41
font_01_sfnt_off000085e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E4 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off00008f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8A 18804 bytes
SHA-256: db707177e1a0df533614fd289cf2b470ee37edf039339bb568c3977480a042bc

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