Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f1fd4846e19ae6…

MALICIOUS

PDF

41.7 KB Created: 2021-05-14 22:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0ccca1c14facd9ffc049642edd065d0b SHA-1: 35a24412fcacb933f52dd41f82f898afb7103942 SHA-256: f5f1fd4846e19ae6f4a16b28ed68129a651992cab01d4e81c0366d49647311fc
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free Robux'. The primary lure URL is https://netcdn.xyz/app/431946152/how-to-hack-roblox-to-get-robux-game-hack, which is flagged as a malicious redirector. The document body, though partially corrupted, contains similar URLs and text related to game exploits, indicating 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-hack-roblox-to-get-robux-game-hack In PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-codes-2021_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_003_off00004781.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4781 24552 bytes
SHA-256: 1ebabb3f69575302dc0b11adfcac7d495466096af870c4f1dd02ebad36ecfadc
font_01_sfnt_off00007f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F77 18588 bytes
SHA-256: 6723e17a0e3ea7e17da9fa5ee91cb22fe0fa4706a6f3d09ae44dda015c08872b

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