Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65c6f4f93cb458a…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 12:48:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 15d97e5011e78ec7d158ab63cfad4928 SHA-1: 082af08204757969146d6cd8c5bd03b737d2e384 SHA-256: f65c6f4f93cb458acd4a131a5135e5bc808bc5dda938431bb57d77f2ccdb3f2b
260 Risk Score

Malware Insights

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

The PDF contains numerous links designed to lure users with promises of free Robux and game hacks, impersonating brands like Microsoft. These links redirect to malicious infrastructure, indicating a phishing or scam campaign. The presence of multiple external links and a ML classifier flagging the PDF as malicious strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/easy-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/easy-robux-game-hack In PDF document text
    • http://bit-sky.com/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-hack-someones-roblox-account_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_off0000489d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x489D 25856 bytes
SHA-256: d60e5e993e9232702511ffd44ba6cd8e7ac4179968157851c461083f551e2d5d
font_01_sfnt_off000083c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C4 18260 bytes
SHA-256: 6f89279168fd50a5f3cec5bfd170c68a2c9d13d585bdac07df4f7428a81fa8a5

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