Malicious PDF — malware analysis report

Static analysis result for SHA-256 b139322acf3073e8…

MALICIOUS

PDF

39.7 KB Created: 2021-05-21 10:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b928666544b5e80acabe20304a7bf665 SHA-1: 3f1aff5be21fc866df3842b6d726af63e8cb2e7a SHA-256: b139322acf3073e841a7faa2f0d39110ac47d2606770c978f768fef6db9f59e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and a prominent call-to-action to download game-related content, which is a common lure for malware distribution. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the document's deceptive content suggest it is designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/479516143/free-minecraft-skins-xbox-one-game-hack In PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-buy-robux-for-free_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_off000035dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35DC 25140 bytes
SHA-256: 89ee41414624bc74e53fe0adeffe9afd63e5f2f6a2e297d6d68b573d06cfd3e9
font_01_sfnt_off00006e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 3092 bytes
SHA-256: 3811f2fb1880daf4953efcc9c7427d9b438bced237490b00be4a6ec3ecea79e0
font_02_sfnt_off0000792d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x792D 18476 bytes
SHA-256: 232ed5a85e3eb7365037632e89adcc3de647f06670efb3a8119b1009e47d113e

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