Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a878ccb7a7a1d3…

MALICIOUS

PDF

42.8 KB Created: 2021-05-20 03:05:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c54ca13019130f35cac449f580bd2c02 SHA-1: 60b4a3a9b20b50c3e424694eafeafa28bf3afc30 SHA-256: 69a878ccb7a7a1d36a6e9a2d778c056a1159ea5dcacd2bbf3015bdfa58c1cdcf
200 Risk Score

Malware Insights

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

The PDF document contains embedded links that impersonate PayPal and lure users with promises of free game currency or hacks. These links redirect to malicious infrastructure, specifically `https://netcdn.xyz/app/431946152/lazyblox-com-free-robux-game-hack`, which is associated with credential phishing and potentially further malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/lazyblox-com-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/lazyblox-com-free-robux-game-hack In PDF document text
    • http://tdfsinfronteras.com/images/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/coin-master-online-hack-2021_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://tdfsinfronteras.com/images/free-roblox-card_GM431946152.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_off0000498c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x498C 24956 bytes
SHA-256: 62ecfee9bb7576dfb82d1f0c666923887b74dcddf8e02fc72a9b6e121b3c3a3c
font_01_sfnt_off0000835c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835C 18840 bytes
SHA-256: c7a12f46af2ab2e47f5138dce66a585f9a7928693d977e55c66cac0a0236f754

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