Malicious PDF — malware analysis report

Static analysis result for SHA-256 613d6515050bf785…

MALICIOUS

PDF

29.4 KB Created: 2021-07-20 11:22:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d41f8ffdff3cb03d6bdcf7950ecdc4cf SHA-1: 69da8316dde78e8d45d0cf8b261cce042aeaf12c SHA-256: 613d6515050bf78571c61bb77f68c3e9d757325746bc99f04fd6be8bb3e9e61d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link that redirects to a website offering a 'free generator / game hack'. This is a common lure for phishing or malware distribution. The embedded URL 'http://netcdn.tw/app/431946152/is-it-possible-to-get-free-robux-game-hack' is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to trick the user into visiting a malicious site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

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 http://netcdn.tw/app/431946152/is-it-possible-to-get-free-robux-game-hack In 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_off00002061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2061 21764 bytes
SHA-256: 53424ba5f0f7ad36a16595137acfd3015948ac083039f7acade29638ff16cbaa
font_01_sfnt_off0000507b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x507B 18652 bytes
SHA-256: 629a1f78ecddab60fe069978906664a96ea403a4dd3f143580db508cca550ec9

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