Malicious PDF — malware analysis report

Static analysis result for SHA-256 722539db81642040…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 05:07:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dbefd2de817bb6a807139a9a5bacbe46 SHA-1: 418c6034b9f11288aa8506849315d50483fecded SHA-256: 722539db81642040aa1dbc6629aaf3788ac66db6159edf0204ab386fb04c0b9f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to external websites, masquerading as free generators or game hacks. The primary malicious link directs to a "coin-master-free-spins-today-new-game-hack" page, indicating a social engineering tactic to drive traffic to potentially malicious infrastructure. The document's structure and embedded links suggest it is part of a link farm or SEO manipulation scheme to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-free-spins-today-new-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-dayz-cheat-code_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-phantom-forces-hack_GM431946152.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_off00004fcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCB 24400 bytes
SHA-256: 51b1fcff9c30d93d4e548783d72a18a0346ce010bfbc9ad92e4474d60fb14a9e
font_01_sfnt_off000086a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 18404 bytes
SHA-256: 18e77bbf6fe8462b755cd6d2d41f5b898be86405eb57ffa87df3bebfe1b33752

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