Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7309b9777fb727…

MALICIOUS

PDF

43.0 KB Created: 2021-05-20 04:45:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9491629a1cbfb5475a03bee3a92b629c SHA-1: 3246d52351dd7f00299d3112063291c244a4a395 SHA-256: bc7309b9777fb72746dca1a5fd70f7ec53558948d39c62a5c8bbe8681d4b314e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, indicative of a lure to drive traffic to potentially malicious or ad-heavy sites. The primary redirector URL is https://netcdn.xyz/app/479516143/scaffold-minecraft-hack-game-hack, and a large number of other PDF links were found, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the overall pattern suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/479516143/scaffold-minecraft-hack-game-hack In PDF document text
    • https://www.les-sp.org/images/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.les-sp.org/images/get-free-spins-coin-master-2021_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_off00004e7a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E7A 24656 bytes
SHA-256: 99f240861607a8f07e6377023103b95f8a57b98caff6d45c04c9d0971ad158bb
font_01_sfnt_off00008663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8663 18128 bytes
SHA-256: f7370529bf904c5857fe4eab30760dda605e07161f807833dcc82124085588a2

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