Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc53208c7588076…

MALICIOUS

PDF

40.9 KB Created: 2021-05-20 13:01:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b0bf0ff29384a841e00ea85fa3f722cd SHA-1: a935f22efccf6b29aa9fb3617c177facbee35547 SHA-256: ebc53208c75880768dc35a552d71d112a7abd60d258d911edfb9bbbb456cc836
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free accounts, which is a common lure for phishing and malware distribution. The heuristic findings indicate the PDF links to known malicious redirector infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7445

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/password-free-roblox-accounts-game-hack In PDF document text
    • https://opac.pasca.isi.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-do-u-hack-roblox_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
stream_002_off00003399.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3399 27176 bytes
SHA-256: 1aec9b88b84c736911fe2e6e0f64a60f88b0c01ceb5188291d7927497504d314
font_01_sfnt_off000072c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00007c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C66 18912 bytes
SHA-256: 1b29181742e2ef30ff3df4dc3eee1b9712f576a454661d5ba560d20368e59244

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