Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bcd947deb813d4…

MALICIOUS

PDF

36.9 KB Created: 2021-05-21 13:42:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2102bcfc062508e59a803ae22ba189c7 SHA-1: 306e658e5b15247493e884183c706b29da977758 SHA-256: d1bcd947deb813d489bd87938a56f82c3bceac5bf9dc48da23e845b04d118ae9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with text and a button suggesting a 'free generator / game hack'. The ML classifier also flagged this PDF as malicious. The embedded URLs and the document body strongly suggest a phishing or scam attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.xyz/app/431946152/roblox-free-download-game-hack In PDF document text
    • http://atmos-service.com/images/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/is-minecraft-free-on-nintendo-switch_GM479516143.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
stream_002_off0000319d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319D 26156 bytes
SHA-256: 595a3b0077714469a280d1ab3b1c2af0d5c24ced9514db36bccdb82bd418cab9
font_01_sfnt_off00006d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8F 18680 bytes
SHA-256: 4713be9169544f6656b4c8be21c2a58d7eafaa04b5602a230b8b1e84fc41e5af

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