Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3947bb530dfb3e…

MALICIOUS

PDF

46.6 KB Created: 2021-05-11 18:03:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c5f9cf7a269c872a9c05e20582ef483 SHA-1: 0f29961a8f90a9d9586f5287a1d578a5271de908 SHA-256: 8d3947bb530dfb3ec1245a7d02dba30d8bca87a72da152c396c632aaa87945aa
260 Risk Score

Malware Insights

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

This PDF document contains multiple links designed to lure users into clicking on them, promising free in-game items or currency. The primary malicious URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-instantly-game-hack, is associated with a brand impersonation lure for UPS. The document also hosts a large number of other PDF files, suggesting a link farm or SEO manipulation tactic to distribute these lures. No scripts were extracted, but the embedded links and the nature of the lures strongly indicate a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/how-to-get-free-robux-instantly-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/how-to-get-free-robux-instantly-game-hack In PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/block-best-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/infinite-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://elearning.man3pk-kotamakassar.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_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_off00004ddc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDC 29864 bytes
SHA-256: 8af019610a915e70a53c0c6e14b44f26f36ced029cbfa97b708b07d375184281
font_01_sfnt_off000092b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B0 18764 bytes
SHA-256: 19eb0a1aeef998e7db468722215b94b9b4bc3d0fba007f3cca2c49ee7cc94cee

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