Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5af6c2cdb768df8…

MALICIOUS

PDF

51.7 KB Created: 2021-06-03 08:09:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e8ed9043c0d8cf17f29fed0595fdd275 SHA-1: bb207e50476cb713f197703c7daf6cb889a1d8d7 SHA-256: c5af6c2cdb768df85ab87fb865d35fb589bff2236426863e9cdfd9245af75be6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'generators' for popular games. The primary lure URL is https://netcdn.online/app/431946152/roblox-com-redeem-game-hack, which is flagged as malicious. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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-com-redeem-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/pubg-uc-quiz_GM1330123889.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BF 24932 bytes
SHA-256: 025a39bb7767b25ed25c4cda9c964d5d90db420525c2b6aa8302a611bb8f8b42
font_01_sfnt_off00008b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B52 8704 bytes
SHA-256: 39621d468ee1ea45cfd77c2a5e31c688636f452f9f0cc0d9213932d691ddc971
font_02_sfnt_off0000a7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BE 18220 bytes
SHA-256: d4b8e24526bb3abbea9f0568b0d8f140a2078d8496f55c5b0be55e4bb875d99b

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