Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fefd56f95695577…

MALICIOUS

PDF

45.0 KB Created: 2021-05-16 04:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6461d20a897b20978dd1da36d10e94be SHA-1: f7fdf12f4cf111b354a25427e2b263711b6bd18a SHA-256: 8fefd56f9569557751f4211269c644f1a3ba8dc5a9b71c90b096e8d1c49e3724
200 Risk Score

Malware Insights

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

This PDF document employs a lure for free game currency and hacks, impersonating brands like Microsoft to trick users into clicking malicious links. The embedded links redirect to known malicious infrastructure, indicating a credential phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-with-no-human-verification-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/free-robux-with-no-human-verification-game-hack In PDF document text
    • http://apotema.com.co/ufiles/files/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/earn-robux_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-minecraft-skins-pc_GM479516143.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_003_off000048b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B5 31444 bytes
SHA-256: 77392d443b8bf77ce1057b26796e6cfa44409d2c7cb754fe4be86ab0cb20aa73
font_01_sfnt_off00008b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3F 19224 bytes
SHA-256: fee2af4c7f09d7ea12136e2767a6473cb73ac52634d47b0a6a367e18f3240d40

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