Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5fbd69a9e3e932…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 21:37:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 01082f55947a31dcaeaf6918fbe7f4ff SHA-1: 09a78630676ac25598c77f2215405067ce08b1f3 SHA-256: 1a5fbd69a9e3e93270963f179b6f5d55960c145362e9a487b24845a9eb4eca79
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and impersonates brands like Facebook and Roblox to lure users into downloading a "hacked version" or obtaining "free Robux." The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-hacked-version-download-game-hack. No scripts were extracted, but the presence of malicious links and brand impersonation strongly suggests a phishing or scam attempt.

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/roblox-hacked-version-download-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-hacked-version-download-game-hack In PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-generator_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-acc_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_off000049cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CB 28492 bytes
SHA-256: 0307e66e4dac0c150e7698eb4748a8b34da7e17602997fc0c2295cb7210ef59f
font_01_sfnt_off00008c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C22 18940 bytes
SHA-256: 045b97c0477fa0a77fe25df190f3dc8d91b636a592878cab4dc6788bf6280dbe

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