Malicious PDF — malware analysis report

Static analysis result for SHA-256 051fb58b2ebf0058…

MALICIOUS

PDF

50.4 KB Created: 2021-06-09 12:00:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a564b0dfbf5182ca6e253a22e982cdec SHA-1: aaf8bbb86cc302018d194d970ce0633767e2949a SHA-256: 051fb58b2ebf00582f039b3e08b6280442c366236e0b08bd4f02c0e47ead1176
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, masquerading as 'free generators' or 'game hacks'. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-get-free-robux-mak20217-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a strong intent to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/how-to-get-free-robux-mak20217-game-hack In PDF document text
    • http://jandimotors.co.uk/images/how-to-get-speed-hacks-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/no-human-verification-robux-free_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://jandimotors.co.uk/images/free-robux-for-mac_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://jandimotors.co.uk/images/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://jandimotors.co.uk/images/ban-and-kick-gui-hack-pastebin-roblox_GM431946152.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
stream_004_off00005102.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5102 29164 bytes
SHA-256: b115434513d2e59562ea3f3303baf8045304b212c560a39fa3709081c7ba1729
font_01_sfnt_off000091ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91EE 3996 bytes
SHA-256: 09f87312e60db0bda418db2b4c86ba5de85c487fd660a1b552c994fa4dcc3de4
font_02_sfnt_off00009f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1D 19336 bytes
SHA-256: 2233ccfcaec9d3de67d985b2ea7637e3addc614bdf9950a471a6dce7edc65a43

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