Malicious PDF — malware analysis report

Static analysis result for SHA-256 78561674841b4e41…

MALICIOUS

PDF

37.6 KB Created: 2021-05-22 10:40:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db33d55d14996fbae7a35c51f8f583a3 SHA-1: c7b1533d998a2a3f73672a5dbd03eefa382c5050 SHA-256: 78561674841b4e4169de8844ddcd268e47e163fc85039e655f916aab442c68b4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to external websites, with a primary lure related to "free Coin Master spins and coins" and "game hack" generators. The critical heuristic firing for "SE_SECRET_RECOVERY_LURE" indicates the document attempts to solicit sensitive information such as private keys or passwords. The presence of embedded URLs and the nature of the lures suggest a phishing or credential harvesting attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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/free-coin-master-spins-and-coins-game-hack PDF link annotation
    • https://elite-house.su/images/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://elite-house.su/images/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elite-house.su/images/coin-master-32-mod-hack-apk-download_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
stream_002_off00003199.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3199 28152 bytes
SHA-256: 11425c746c015cb1ba80b8de914441a407e95f56f47a06083fb522dd80622bbc
font_01_sfnt_off00007241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7241 18060 bytes
SHA-256: 55f53c4f18bfaf59a8fbb6d381f980c96a3f4ad908aa3278e43a985984e68094

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