Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23fba7fbe28efb0…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 21:13:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 552ddaa3439cc55b2675cbd9fe5e97e1 SHA-1: 23616144c52e42c5c1233332d6736d787e8a4bee SHA-256: c23fba7fbe28efb0f8ed1256b67b07fd50db6e0092b6056e12593e628658f7e2
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The document body and heuristics indicate a lure for game hacks and free currency, specifically mentioning 'Coin Master' and 'Robux'. The presence of a 'secret recovery' lure suggests an attempt to phish for sensitive credentials. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/hack-coin-master-2021-pc-game-hack PDF link annotation
    • http://unifieo.br/images/_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/robux-gratis_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-coin-link-for-coin-master_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_off000048fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FB 24744 bytes
SHA-256: 3d307df20766df22068de461face20c94a2cf390f0a0bcff59bad8c217efa884
font_01_sfnt_off00008206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF1 18272 bytes
SHA-256: 8f307cdc696a3c0f8826b97bc83261752f53ae34b16e8994a9d0994350048eb4

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