Malicious PDF — malware analysis report

Static analysis result for SHA-256 960128c53628b708…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 15:45:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aca363d01f8b299f8c3a6cd0469680f2 SHA-1: 0e67753e8cccb33f771f16c544413baa132d44ce SHA-256: 960128c53628b708ab29a2c524c51f82dd70688a0296e6a6b3f8d4ce611c9eb2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, masquerading as a 'free Robux generator' to entice clicks. The document body and heuristics confirm the lure is for game-related cheats, specifically Robux. The ML classifier strongly indicates maliciousness, and the embedded URLs point to infrastructure associated with malicious redirects.

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/how-to-get-free-robux-instantly-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-codes-2021-november_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-legit-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-twisted-murderer-free-radio_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-weird_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-vip-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-got-talent-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/mad-city-roblox-hack-pain_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/bimsqa-complex-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/october-2021-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-creeper-chaos-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/original-roblox_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_off00003046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3046 22340 bytes
SHA-256: 0c98a7ee89b6cc3cc08fea22f3cfd5987a9e9ccf95ab58d8f71add466fa90202
font_01_sfnt_off000061e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 19240 bytes
SHA-256: 46dd4588562bbb2dce6134725fa943138dd103635f5b260b652d173228825468

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