Malicious PDF — malware analysis report

Static analysis result for SHA-256 157b314a94f4f0f3…

MALICIOUS

PDF

44.2 KB Created: 2021-06-04 00:02:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cee16c56f970820c009bf8079ef1f978 SHA-1: 4ec9869a94cea6cd82dcdaba3e0a81cce2b4685b SHA-256: 157b314a94f4f0f32c59f336bffdfe812390d674d14e223ca9815f401e2b7cbf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically luring users with promises of game hacks and free items. The embedded URL, https://netcdn.online/app/431946152/free-roblox-clothes-codes-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to game-related terms and the malicious URL, reinforcing the lure. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/free-roblox-clothes-codes-game-hack In PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spins-link-no-verification-2021_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_off0000516e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516E 24864 bytes
SHA-256: a8efd0c3f84d2afc7f6bad1ad0a9fa2b203eceb2769cfd1e130d5281108820c6
font_01_sfnt_off000089eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EB 18392 bytes
SHA-256: 8f170c24a43a5cea343fe8e0c347968302273409877848d607eb86d714eb009a

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