Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bfff8ba9b8617a…

MALICIOUS

PDF

40.7 KB Created: 2021-05-21 10:52:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c3a556de94c449cb6bed71286face203 SHA-1: eced55239ee8ca9d8aa6c16a6a153cd33bd03796 SHA-256: 28bfff8ba9b8617ab167d4bb6924f35953314fc02a490d3fc39d593d04710a2f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game hacks. The document body and embedded links suggest a phishing attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector is being used to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7508

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/is-there-any-way-to-get-free-robux-game-hack In PDF document text
    • https://belajar.mansalotim.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://belajar.mansalotim.sch.id/__statics/gudangsoal/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://belajar.mansalotim.sch.id/__statics/gudangsoal/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://www.belajar.mansalotim.sch.id/__statics/gudangsoal/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.belajar.mansalotim.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-game-ios_GM406889139.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_off0000351a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x351A 26068 bytes
SHA-256: 6c191b90d5cc1cda53cc024d668b9ced412a1717f7a6359c7dac1d7324f2f718
font_01_sfnt_off000071cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB8 18892 bytes
SHA-256: d4b621edf5ac5f073c5a65dd804db4f1f2ad13c123c1b5ace541ce5f5c284f58

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