Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc998d64b1d2c921…

MALICIOUS

PDF

34.5 KB Created: 2021-06-30 03:53:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8b1be924d6abe3bf519026232b0519aa SHA-1: 18b34f4872b08e319f63edf14e8f2eff688e6600 SHA-256: cc998d64b1d2c921c7a6249cd1978c4397d70922b37a1ea3a7303b0649654c80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free robux'. The primary malicious URL identified is http://netcdn.co/app/431946152/april-1-roblox-hack-game-hack. The document body and embedded URLs strongly suggest a lure for users seeking in-game advantages, which is a common tactic for distributing malware or conducting phishing operations. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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.co/app/431946152/april-1-roblox-hack-game-hack In PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-hide-and-seek-extreme-cheats_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-clothes-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/cheats-for-roblox-realistic-roleplay_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-hack-money-script_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-weird_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-pc-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-online-dater-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-2021-no-download_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-free-headphones-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 22608 bytes
SHA-256: 94a44ae424249f682f5dabf54cc8aac4fc3529816e387c491dc3fe4edc1259ff
font_01_sfnt_off000061e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E1 19056 bytes
SHA-256: ec417d7ccae7f2acc0a15be2b451c87629482922428d7db945427e5f972fb7bc

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