Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e86f36b0a703c41…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 12:06:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 11e5e2afb9458ec0b7b2c47122570ffc SHA-1: 537eb5d24a4086552b537e46975348ec0a8ca53b SHA-256: 3e86f36b0a703c4187e37ac049adc72ec98e6c018881113260bbfcd6fdca1f6d
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-get-free-robux-easy-on-phone-game-hack PDF link annotation
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/mount-everest-roblox-free-rescue-gamepass_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-robux-generator-for-kids-no-password-nosurveys_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/tiktok-free-view-jelly-fruit_GM835599320.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/free-colouring-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana//repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/roblox-in-cheat-ingine-work-in-pizza-place_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmmbk.com/cendana/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.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_off00003377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3377 22916 bytes
SHA-256: e58d97e57dcc981975c36e7f26ea8a887c7c9e402f41db68bf51ad4835ae9be3
font_01_sfnt_off000066b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B9 19484 bytes
SHA-256: 10e6918622a1e1d776f2ac179078ec20795c6faf86adaf8098abaca9041529c9

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