Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3c58dcd638487a…

MALICIOUS

PDF

53.3 KB Created: 2021-05-17 21:31:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ccd345a03ceec646388888a9ca71aa4a SHA-1: a765cbb19c8412d6e4c72015ade81fd9ad923b2d SHA-256: 3c3c58dcd638487ac791efd98b77690d72e0d4e81125c50f3f3f9f8773248f2d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, under the guise of 'free game hacks' and 'robux generators'. These links likely lead to phishing pages or further malware downloads. The presence of numerous SEO-optimized PDF links suggests an attempt to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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.xyz/app/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • http://spentulib.com/search/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-hack-roblox-for-robux_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
font_00_sfnt_off00004cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC1 38464 bytes
SHA-256: f09300559abd5729285607ea200ca2a79bbb9fd7865f4bbc22ee090e2835161a
font_01_sfnt_off0000a127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA127 3576 bytes
SHA-256: ad9e8c4952ec02499e37b5cab1629ac258599766fd8f355a23c8139201b6847d
font_02_sfnt_off0000ad14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD14 18684 bytes
SHA-256: 65f445f0396e54760dd2a1edc1744209422bc48f29c35ea74a9bcb72e79f8b06

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