Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b70588cd5f0536…

MALICIOUS

PDF

29.8 KB Created: 2021-07-19 00:54:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 62f37a3daef1278bb193e46e343bfd3f SHA-1: d2b2d82b23b2e53addcc2e19d36f792fa6ade16e SHA-256: 77b70588cd5f05361d22acc30a76c491b05d863000d5668563eb1dc10cbdf5a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and sites offering 'free generators' or 'hacks', indicating a phishing or scam attempt. The document body explicitly mentions 'Robux Com Free' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/robux-com-free-game-hack In PDF document text
    • http://magistrinfo.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-spins-and-coins-for-coin-master_GM406889139.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_off0000216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216F 22096 bytes
SHA-256: a4e0b84a930a0d4cd59126e36f26f31a0477a23f941365539b1331ba43975054
font_01_sfnt_off0000523c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x523C 18460 bytes
SHA-256: 4a32e366c4d91d7d134c7dbb73cf2529d0f331c5de2309c0ca0f4850ac867bfa

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