Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bacb35655f50b7…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 09:40:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a0468065ea8f3f7e5c7b194fadd36955 SHA-1: 88b5cdc212cdaabbbefe6cabab06c30d1624fc6e SHA-256: 17bacb35655f50b712f4f5c2f73dd0e571981ac6b36a2f545796488123129348
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as generators for free Robux and game hacks. The document body explicitly mentions 'Free Robux Websites 2021' and includes the malicious URL, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier firing further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-websites-2021-game-hack In PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/free-robux-console-hack_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/roblox-hack-copy-and-paste_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/roblox-obc-hack-no-survey_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/how-to-get-a-dj-pass-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/roblox-always-day-hack_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/pubg-uc-18_GM1330123889.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/robloxmainacom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.gdsmortgage.com/uploaded_files/userfiles/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
font_00_sfnt_off00003118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3118 21836 bytes
SHA-256: 62aadae3553e0b1efe964d554cdbcc8be27471ac8b47897d37f11229c373bd67
font_01_sfnt_off00006123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6123 19540 bytes
SHA-256: 7dbc8426627c63cb62956a50d2295124057d24afa4e6276b198320b3de5f5879

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