Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62c0eef28bec20d…

MALICIOUS

PDF

44.9 KB Created: 2021-05-15 10:00:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bb0490caa04318ccc49d3b7b4e9778d3 SHA-1: c076fc7ffde96b9e148771d943dc7bb7289a31dc SHA-256: c62c0eef28bec20d11beffaee3eb14c9f61937670f2ac4c5c5e196da3fb1de79
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'free generators' and 'hacks' for popular games, which is a common lure for scams and potentially malicious downloads. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure and presents a fake CAPTCHA, further supporting a malicious intent. Although no scripts were explicitly extracted, the nature of the lures and embedded URLs suggests a phishing or scamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/freecoins-game-hack In PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-hack-spin-generator_GM406889139.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_003_off000048fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FD 25744 bytes
SHA-256: 9f29c7cdac6a6666e84e630540ebcefbc62feba380c48f919b0dd0ba8c3e6ccf
font_01_sfnt_off00008491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8491 3460 bytes
SHA-256: 27f6ee24b80a0c45a340e32027a43d6c3a7853aac96563eed14d58819399f6a8
font_02_sfnt_off00008ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFB 17380 bytes
SHA-256: b7451c9dd0ac59d2b5cb55b76db2f7cf076c87adc9efeb70e2d733c8c551e0a5

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