Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca32d1321d3450ed…

MALICIOUS

PDF

45.6 KB Created: 2021-05-12 15:32:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a56789e5615a512e7869d307436123f4 SHA-1: ec826d48ac3bd3d949aa194814c4c84b2b495030 SHA-256: ca32d1321d3450edf9fec212b5bd2177f463e1aae1f375c9c157274716479022
200 Risk Score

Malware Insights

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

This PDF document employs a common lure of free game currency and hacks for popular games like Roblox and Coin Master. It contains multiple links that redirect to malicious infrastructure, impersonating brands to trick users into clicking. The ML classifier also flagged this PDF as malicious, indicating a high probability of a malicious workflow, likely involving credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/roblox-help-free-robux-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/431946152/roblox-help-free-robux-game-hack In PDF document text
    • http://www.hlad.hr/files/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/robux-sign_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-easy_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_003_off000047ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AC 25204 bytes
SHA-256: 1cedfc34e7556fcf280cddc51ab7f09ecc06c9b4124800e53bf343bde3848479
font_01_sfnt_off00008212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8212 4008 bytes
SHA-256: 515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593
font_02_sfnt_off00008f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9E 18264 bytes
SHA-256: 4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127

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