Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c795f2f0591fdd…

MALICIOUS

PDF

37.6 KB Created: 2021-05-21 01:54:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1cb46ab9c4ad1eda52a155a0c9f9ae2e SHA-1: ac6459c05e6f6940ae183427eb35ff36adaa8550 SHA-256: c8c795f2f0591fdd08eca661bc859106a7473b5f3993cbd0759a3918bce298c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to known malicious infrastructure. The document body and heuristics indicate a lure for "free generator / game hack" content, specifically mentioning Roblox. The presence of embedded URLs and the ML classifier's high confidence score support this assessment. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links within the document.

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/how-to-get-free-hats-on-roblox-game-hack In PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/is-uc-pubg_GM1330123889.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B9 26176 bytes
SHA-256: a92c205da845184abd9cd05c059b5540448320cab1aa32f6a6f44025350aab56
font_01_sfnt_off00007107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7107 18444 bytes
SHA-256: f9b9939c38b76b443be916ca51f6b578d8365b374db70a09f9dd3538b986228f

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