Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b86509552a6b16a…

MALICIOUS

PDF

39.9 KB Created: 2021-05-10 11:35:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b36a6d77f38722ad32339bf8a9d60743 SHA-1: cf97f4b1572983df17b351cefaf52745db3faaad SHA-256: 3b86509552a6b16a0a134c75233d082109dfe83e0a8bd6e22eef32061cfe1502
170 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to a malicious URL. The document also instructs the user to press Win+R or paste a command into a terminal, consistent with ClickFix attacks designed to bypass macro restrictions. While no scripts were explicitly extracted, the presence of embedded URLs and the social engineering tactics suggest an attempt to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/how-to-hack-a-minecraft-account-game-hack In 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_003_off0000370f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x370F 25372 bytes
SHA-256: 5b5a6aa2be2d6146df161e586551edca3a99b68f3b00812426f2807e32f994ea
font_01_sfnt_off0000708b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 3056 bytes
SHA-256: dd24a0ab94df4552e459bd06fd01b0fd3f021c1d51d1d64407070e735974a028
font_02_sfnt_off00007afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 18184 bytes
SHA-256: 9b8f26e31d459421e9e5b83d6a53d579ef5ea49b0db69369fb37c1c5c6cb5db0

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