Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2f3f167c0cbe4f…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 10:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2b21cf12f3a7eff57ceefab5a2033aa8 SHA-1: 6f93dfaab2044a7352b53dc75d643f1352374afd SHA-256: 7d2f3f167c0cbe4f235cd2a32e91c0f724459a30a2ee8cf0b598ae411a00ca3b
202 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 seed-phrase/secret-recovery lure. 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 0.9865

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/daily-free-spins-coin-master-2021-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/pubg-uc-200_GM1330123889.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/games-that-give-free-robux_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_off00004f12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F12 24304 bytes
SHA-256: 1f405f549546e4ad242cde10b29bf19e8cf3f9636a92e40f1efc1802f94c2d68
font_01_sfnt_off000086e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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