Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbb0edebb1b2d1b…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 08:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba76d5f96ac4a78bb4b44739f543ee19 SHA-1: 449264720501e0a9abfdf917e8ea32389f3a165b SHA-256: 9cbb0edebb1b2d1b517c808d4875379cb1eae69a1b9c1f1e9344e6972c452939
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, which are common lures for malicious content. The primary link directs to a known malicious redirector infrastructure. The document body and embedded artifacts are heavily obfuscated, but the presence of multiple links to external PDF files and a malicious redirector strongly suggests a phishing or malware distribution attempt.

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.
  • 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.
  • 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.online/app/431946152/free-robux-instantly-game-hack In PDF document text
    • http://rgadventure.com/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/hack-coin-master-no-verification_GM406889139.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_off000052ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AC 26296 bytes
SHA-256: d82b432dd1d6fbb9e6038a1a96d4ec2dbf43cbdbe51c0bfb487c001e102edbfc
font_01_sfnt_off00008eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEA 18600 bytes
SHA-256: eeb00711cf2e5591db958639ea5d908a8ba1b5c4404aa75c69e8a5349c023cb9

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