Malicious PDF — malware analysis report

Static analysis result for SHA-256 8486fb23f1fecebb…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 05:21:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8e1b7f7447c285dbcb2d16961467f3d0 SHA-1: 9ec13c58bc1e39a9d407753b95071aa820227b04 SHA-256: 8486fb23f1fecebbcd0ea100fed55c20716a5e4eb609985a489c0a276f0b186d
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as malicious redirector infrastructure. The document body and heuristics indicate a lure for free game currency or hacks, likely intended to lead users to a phishing or malware download site. The ML classifier strongly supports the malicious nature of this PDF.

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/free-robux-without-survey-game-hack In PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/pubg-uc-400_GM1330123889.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/get-free-robux-real_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-kitty-roblox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/robux-get-free_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/earnrobux_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/roblox-jailbreak-speed-hack-codes_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/a-discord-server-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-robux-no-verification-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
font_00_sfnt_off000031a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A7 22656 bytes
SHA-256: e94b64b0318cd9c348fbf9781c09ed80fd7a16a16e325f7762700e34576bdaa6
font_01_sfnt_off000063fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FB 19600 bytes
SHA-256: ea618dc0ac89057573f0900fc77451ab5142be89e827617cc4892c329dfdb229

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