Malicious PDF — malware analysis report

Static analysis result for SHA-256 c044c3370c36df5b…

MALICIOUS

PDF

50.2 KB Created: 2021-05-11 17:00:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ffee51771c0846b4e370643d423950e SHA-1: f3589624c7bf64f58b1bff79646a170913bca0b3 SHA-256: c044c3370c36df5b6e1a33b759b5185dc9927abeb9044f013605907ec684337f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-hack-roblox-accounts-2021-easy-game-hack PDF link annotation
    • http://tapinkab.go.id/assets/CKImages/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/robux-rewards_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a87.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A87 29020 bytes
SHA-256: 12e9b77a962c60359d3fd4d020fdadfbde434c78706d182808a2172cf79064db
font_01_sfnt_off00008cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF5 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED8 19172 bytes
SHA-256: 0a4c192dd0d49b475d670e2028b2e3d9bc88486e58824ff416e2d46c0acce708

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