Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f748c7c35c10d9b…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 12:41:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 01e71b6aacc266d8952e41d65637fda6 SHA-1: 04b9a91955499fbad75ef659b5961f4ba143dea5 SHA-256: 4f748c7c35c10d9ba1cedbc10bed72bc04005d25048c34be3799e7111030501e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to a malicious redirector, specifically advertising a "free generator / game hack". The document body, though heavily obfuscated, contains the same URL. The SE_CLICKFIX heuristic indicates the document likely instructs the user to execute a command or open a link, further supporting a social engineering attack. The ML_NYX_PDF_MALICIOUS classifier also flagged this PDF with high confidence.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/best-free-hacked-client-game-hack In PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-source_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-rape_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
font_00_sfnt_off00004ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA4 24360 bytes
SHA-256: 4ae78c9723730f9fae1d0e75bbda274ab7dd6be119b5ff182aafb083c5366a96
font_01_sfnt_off00008334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8334 18200 bytes
SHA-256: f9e1919cba188461631b4d1f41fa639bbd05523e10553c39d41e2ec7b66d941b

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