Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb61ab9e2074336…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 06:50:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 335a0117b235b6e15718199e0c8954bd SHA-1: 71c9469ec8b05469e1564c9ffdb9215edbc0860a SHA-256: 0fb61ab9e207433682db79dee012b4fb2742acd923a26e78b683a93eef35395d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free robux' and game hacks. The primary redirector URL is http://netcdn.tw/app/431946152/rbxfree-com-free-robux-game-hack, which is associated with known malicious redirector activity. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/rbxfree-com-free-robux-game-hack In PDF document text
    • https://www.tena-g.hr/files/roblox-work-at-a-pizza-place-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-jailbreak-free-exploit_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/robux-hack-2021-mobile_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-hack-scripts-copy-and-paste_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/gameresources-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-codes-2021-october_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/apps-that-will-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-use-cheat-engine-on-roblox-level_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/demon-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/ban-hack-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-coins-coin-master-no-human-verification_GM406889139.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_off00003152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3152 22244 bytes
SHA-256: e13cce9cd65226fe072818c1a011b98e88e08661673f5f701e0d6bd539c56dbf
font_01_sfnt_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 18976 bytes
SHA-256: 2aa9052e4078dfdf09f927976bfd3cf76f1a678b4d9b3ecd6888c6d9efbc292b

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