Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7e04d2eca0cea…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 01:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b48421a0bede532980ce87b715151760 SHA-1: 42d90a03c1c89dbb37f1108621af7330b6a735a5 SHA-256: 92a7e04d2eca0cea6841c5c650c050eb38c58ecbcb65d0c7ea7fd514720cc507
200 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and impersonates Facebook to lure users into clicking on them, likely for credential harvesting or to download further malicious content. The heuristic firings indicate a malicious redirector and a brand impersonation lure, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-get-free-stuff-on-roblox-catalog-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.tw/app/431946152/how-to-get-free-stuff-on-roblox-catalog-2021-game-hack In PDF document text
    • https://lib.insan-unggul.ac.id/repository/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/cheat-dbr-roblox-ccv3-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/start-earning-free-robux-today_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/tiktok-free-internet_GM835599320.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/hacking-roblox-by-hacking-roblox-by-zia-lets-play_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hacker-group_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/pubg-uc-sale_GM1330123889.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/pokemon-go-free-roam_GM1094591345.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-vip-server-jailbreak-free_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_off00004fb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB0 27580 bytes
SHA-256: 9e98c23e64faaf754031d4c8d98225ba1f16afb5abfed38e5de389142e92633a
font_01_sfnt_off00008dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC0 19272 bytes
SHA-256: f38665816855756673de83c5782c2242eda4665a3885750914a413ffcf33b966

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