Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f53535bf823917…

MALICIOUS

PDF

40.1 KB Created: 2021-05-20 21:28:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: de19e7d19fe9b4bc33bbea691474655e SHA-1: a8dcfcff542e3804b5cb8902621b9a98dcaad26d SHA-256: e3f53535bf8239172b95904cc1586479cf0d2fe6706c82994ced709af6500653
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.8010

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/835599320/buy-tiktok-followers-free-game-hack.
  • 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/835599320/buy-tiktok-followers-free-game-hack PDF link annotation
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-no-human-verification_GM431946152.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_002_off00003159.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3159 27724 bytes
SHA-256: 8a94c9ac29ff5d6bbec0e43623e06396aa59995c2babd06c6a7d43a250cd5e02
font_01_sfnt_off00007091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7091 3124 bytes
SHA-256: d6dd29adb69da7f9a23a5e3791282a61e2f811794f560a0c409c8747766d9102
font_02_sfnt_off00007b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 18232 bytes
SHA-256: 961899ff1eb424bdaf12ead7fcaccf2d09ae623c60a9c1ffe8485e19a18d4dd1

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