Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcbcb34b0ae09c7…

MALICIOUS

PDF

39.7 KB Created: 2021-05-22 10:07:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 227d0da9f6258d0fab5adba409d60b4d SHA-1: cf89418a010d30552c141060a4cf653110ba577c SHA-256: adcbcb34b0ae09c77bd1fa549a6d93b18e6029df3ecd99f4492bc63b8a45eb06
122 Risk Score

Malware Insights

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

The PDF contains a lure impersonating Facebook, promising free spins for Coin Master, and directs users to a malicious URL. The embedded document body text and heuristics confirm this is a credential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/free-spin-link-for-coin-master-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/free-spin-link-for-coin-master-game-hack PDF link annotation
    • http://olimpik.mk/imagescke/upload/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/mistplay-robux_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_off00003571.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3571 24444 bytes
SHA-256: ef326b5601d9b792b134b8a94c1ad4eac4c78d34fbf2395f2bf9fe60f0f90780
font_01_sfnt_off00006dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDE 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00007a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 18056 bytes
SHA-256: b406b504177f6b640bc1dbcd325e02770f8a0621b64b682f119f0b5c1d0e735d

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