Malicious PDF — malware analysis report

Static analysis result for SHA-256 165f57e4f6e8e00c…

MALICIOUS

PDF

44.5 KB Created: 2021-05-14 23:43:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ee6c79c3963dded6da9549526c38181 SHA-1: 095f9ff832fdbc1d799d78bc27e4f8e24a430b5a SHA-256: 165f57e4f6e8e00c706064e8a423fa6c0940c2fd7879066476ae3c0f4b3c6365
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains multiple links to known malicious redirectors and impersonates Facebook to lure users into clicking on a "free generator / game hack" link. The primary link, https://netcdn.xyz/app/406889139/claim-coin-master-free-spins-game-hack, is associated with credential phishing and potentially malware distribution. The document body, though partially corrupted, contains this URL and other similar lures, indicating a clear intent to deceive the user into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/claim-coin-master-free-spins-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
  • 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/claim-coin-master-free-spins-game-hack In PDF document text
    • http://mbbs.hr/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/abd-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/i-didnt-get-my-free-spins-in-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_off00004947.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 24904 bytes
SHA-256: 2b6c3ac8a124072ae633e7703decb0be8263c9391cd1468c500b7bd3b21ebc67
font_01_sfnt_off00008212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8212 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC3 18220 bytes
SHA-256: 51400cf6f83d27ff8541fca55c054d9c932d538c26085d145cd133625b41aeb8

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