Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2a1c022c391614…

MALICIOUS

PDF

36.5 KB Created: 2021-05-25 11:39:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 317d721e4905a48a7fb595b40ecc6214 SHA-1: 0fe5a80474b8c58b432f65e755734b97be90c258 SHA-256: bb2a1c022c39161413bc7237e3fc59347075bdf21d195a59cbb72949577d116d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body explicitly mentions 'Free Robux Codes 2021 Not Used' and a call to action to access a 'ROBLOX GENERATOR'. This indicates a phishing or scam attempt designed to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent.

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/free-robux-codes-2021-not-used-game-hack In PDF document text
    • http://simpus.umb.ac.id/pustakaumb/slim7/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://simpus.umb.ac.id/pustakaumb/slim7/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://simpus.umb.ac.id/pustakaumb/slim7/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://simpus.umb.ac.id/pustakaumb/slim7/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://simpus.umb.ac.id/pustakaumb/slim7/repository/free-free-robux_GM431946152.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
stream_002_off00003294.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3294 24716 bytes
SHA-256: ac1f11a491c4a4bd216326867ac5f774f65ab2b6b7cdfd6241b84fe345096bcd
font_01_sfnt_off00006b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B82 18880 bytes
SHA-256: 342a41804753b243bf13fa7c19db71c7debbb8fa80f4750c82899b0ccf7aa343

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