Malicious PDF — malware analysis report

Static analysis result for SHA-256 b097ff3b95e0f853…

MALICIOUS

PDF

41.4 KB Created: 2021-05-19 20:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6e5e2aa25edefc1b4c909528f11cea01 SHA-1: c7c5a2c8f5250c4ed950789df0988306d1699619 SHA-256: b097ff3b95e0f853b5d1bc5e4b928cd90f19f0ff7680c21d2187611dc25d3fb2
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a lure related to a "Coin Master Hack 2021" and impersonates Microsoft, directing users to a suspicious URL. The heuristic firings indicate this is a credential phishing attempt or a redirect to a malicious site. No scripts were extracted from this sample, limiting further analysis of its execution flow.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/406889139/coin-master-hack-2021-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/406889139/coin-master-hack-2021-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003247.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3247 30424 bytes
SHA-256: 5d193395c5758dab0cf0ba8097693b3235983197dbe798cbed69afc0b5aae1ee
font_01_sfnt_off00007708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7708 2872 bytes
SHA-256: ddcc3a5e7a6aa1de358cfa90ca854c2543f9d5fa5646cb34984d2fb90089b4d9
font_02_sfnt_off000080ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EF 18116 bytes
SHA-256: 17974cef81917e5ef69542194afa433aff210173cc902887fbc2b56a9328dd03

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