Malicious PDF — malware analysis report

Static analysis result for SHA-256 292cb571b999e1da…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 06:54:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: daa5be98f1c9660975673133c1519122 SHA-1: 5a2a9712238bb22028ff70fdba65a24e0f7d53e3 SHA-256: 292cb571b999e1da3c90fbc5e89b9d3a94efde9a30add7c4f010f795560270b1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks. The embedded URL and numerous linked PDFs on 'iseas.com' point to a phishing or scam campaign. The document body, though heavily obfuscated, contains references to 'Roblox Generator' and a URL similar to the identified malicious redirector, reinforcing the lure theme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-generator-no-verification-game-hack In PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coinmaster-links_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-minecraft-coloring-pages_GM479516143.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_off00004f91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F91 29004 bytes
SHA-256: 542a998e854899b4c5fed74d2c00a3bd7476ae903aa954897aa10b977047626e
font_01_sfnt_off000092ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AE 18372 bytes
SHA-256: 9d8eb5f141d4b1ad2720853a8d1046494e15544c75f06eeb85f368c8fad4d986

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