Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec21a4fb12e48358…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 10:12:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 15f39086c5041cd2d24ddd8116276380 SHA-1: 6ae9053066ee30ddf19c77cb98c1467652401d99 SHA-256: ec21a4fb12e483589dcfb33aaf9616ff94b205d3929c0dce2426055a607ed9a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-hack-use-game-hack, which is associated with a lure for game exploits. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or social engineering attempt to redirect users to malicious sites, likely for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-robux-hack-use-game-hack In PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-often-tiktok-free-followers_GM835599320.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_off000053bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BD 29760 bytes
SHA-256: 42be8bce354693af4e425caa42f2c52137cc08ec8799e7a170b1554f0b3d188f
font_01_sfnt_off000094b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B8 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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