Malicious PDF — malware analysis report

Static analysis result for SHA-256 98849ab44fee0db9…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 10:12:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5e5ceebf2112502e816ffc56a50d4752 SHA-1: 29061c96fb77ea35395acb7716509a058a832677 SHA-256: 98849ab44fee0db9954db912968c2d9d04909773cb3bb4e4497c11b5582c82fb
200 Risk Score

Malware Insights

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

The PDF contains multiple links that are identified as malicious redirectors and lures for game hacks, impersonating the UPS brand. The primary malicious URL is https://netcdn.online/app/406889139/daily-free-spins-coin-master-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users through social engineering, likely leading to credential phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/daily-free-spins-coin-master-2021-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.online/app/406889139/daily-free-spins-coin-master-2021-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-account-hack-unlimited-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/by-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-hack-no-human-verification_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_004_off00005007.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5007 23664 bytes
SHA-256: 4ed080c398817be9efd3b27a19db8c83da3241d347de6f576f88ce9b86628aeb
font_01_sfnt_off00008606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8606 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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