Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97f38a9bdbcb6be…

MALICIOUS

PDF

45.2 KB Created: 2021-05-14 15:01:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f87dfde5a0bc58f4710bc5fbcb69f204 SHA-1: 38697ba63be91ee043b754086e229ab9fd324e5f SHA-256: f97f38a9bdbcb6be76db40a82b067923e668b1b022043a174624913b85253672
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages. No scripts were extracted, but the PDF structure and embedded links indicate a social engineering lure to drive user interaction with malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9473

Heuristics 4

  • 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.
  • 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/431946152/robux-free-robux-game-hack In PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/cm-spins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_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
font_00_sfnt_off00004876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4876 25592 bytes
SHA-256: f6475fc5d212932e8e91ce3f3312acc82c6a47c3a756d5a71059ef87fd9e12e5
font_01_sfnt_off00008201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8201 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 18996 bytes
SHA-256: 01c5fc44086d6c343980756e3704c4e1ef6c0dc625ac2dc21054df4b414d220b

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