Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1e1202d1e56c33…

MALICIOUS

PDF

44.8 KB Created: 2021-05-21 18:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0fc07f68c4fa1e0ad6626d1f75cd15f2 SHA-1: f33917745b79ecfafc50e8dfd472bbeb2b00824f SHA-256: 9e1e1202d1e56c33ff240eb12f19a5f69ceec464f58be535bdcd07dcd85e70e9
200 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, specifically advertising "free Robux" or "game hacks" to lure victims. The document body and heuristics indicate a redirection workflow, likely to download a second-stage payload or phish for credentials. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7481

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-robux-on-chromebook-game-hack In PDF document text
    • http://apostolosandreaslemesou.com/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://apostolosandreaslemesou.com/images/free-attacks-coin-master_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
stream_002_off00003297.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3297 34612 bytes
SHA-256: 91f12ce264152de9d28afd1831bef077737312b9acd4e59eafe3b183e1845447
font_01_sfnt_off00007fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDB 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C83 18880 bytes
SHA-256: cfbdee24d7402b99052158ce8ccd316620959aaec27a5d82eaae160d81e49f1b

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