Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21b94bdde400e20…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 14:05:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f7e8388122a0eff3a87b5a354f97e0d2 SHA-1: b5967330e5dbbea25a98b8b1f2a8dcc376c1396c SHA-256: c21b94bdde400e20d54b40949b512d06249066a353f6d2b7bc46bec25896e52b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains and game-related lures, such as 'free Robux' and 'game hack'. These links likely lead to malicious websites designed to phish credentials or deliver malware. The presence of a malicious redirector link and the ML classifier's high confidence score support this assessment.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.tw/app/431946152/google-how-do-you-get-free-robux-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-instantly-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-high-school-how-to-get-free-gear_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hd-admin-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/como-hackear-vehicle-simulator-roblox-para-tener-12000000-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/ways-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-can-u-get-free-robux_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
font_00_sfnt_off00003446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3446 23208 bytes
SHA-256: aabbe6bd3077fa96f400c03b21c267b7989f0f960536fdd7d3642ce2139a1a1f
font_01_sfnt_off00006878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6878 19388 bytes
SHA-256: e0d82c167f6ca64f121b23a1748ead6b70296300b19a9978e36a20c70c2cac67

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