Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a018005ea4b764c…

MALICIOUS

PDF

44.4 KB Created: 2021-05-17 14:41:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5432a896f4b0307624701756b7d3c9a6 SHA-1: 0c7871a0061c5e3361d1809ab7ce505727500a57 SHA-256: 0a018005ea4b764cae81afa5b73cf8e3855a77502cd29b220cb2bc791facd4c4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including a known malicious redirector, masquerading as generators for game hacks and free currency. The document body and heuristic firings indicate a lure for free Robux and Coin Master cheats, directing users to a link farm of similar PDF files. This suggests a phishing or scam campaign aimed at driving traffic to potentially malicious sites.

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.
  • 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.xyz/app/431946152/roblox-hacks-for-mac-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/wurst-115_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-spins-hack_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_003_off00004acc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACC 27628 bytes
SHA-256: e1cf6fe647e2696e38c6e6196921596b391dc10c0f34b6f8fbcf550fb0ce2416
font_01_sfnt_off00008ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB4 18544 bytes
SHA-256: b54d427420c2b6acb67d73efd488d39bfb4939947f3518d8bf7854551a24b695

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