Malicious PDF — malware analysis report

Static analysis result for SHA-256 281870a8ab38b9d8…

MALICIOUS

PDF

45.9 KB Created: 2021-06-09 06:38:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1276268421366a73f2cec2f89f3f85df SHA-1: 8dcde2f1acb88fc5bfa41f207ce118718eec6702 SHA-256: 281870a8ab38b9d821c7e7be1cfe9eedbfe0ec290bf83fd1b1222b50875c34d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically targeting users interested in game hacks and free followers. The document body, though partially corrupted, contains references to 'game hack' and 'Roblox', aligning with the heuristic findings. The primary attack pattern involves luring users through deceptive content to malicious redirectors, likely as a precursor to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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-hack-a-roblox-profile-youtube-game-hack In PDF document text
    • https://nexsoftech.com/upload/userfiles/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/can-someone-hack-my-roblox_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/robux-hack-no-app-download_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005080.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5080 26960 bytes
SHA-256: 89d95caed0a448d4c98aa8d667d1d8310d0098dbe388f10ecff48a8b9845a123
font_01_sfnt_off00008e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7C 19028 bytes
SHA-256: e3a5e15d37e7a0eb81599f2c55d026e7fc3bcff016da68e1f86c9c9b4ace92a6

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