Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37f1b2e2092bf64…

MALICIOUS

PDF

40.7 KB Created: 2021-05-11 09:03:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5349b9434bd2037b0fc1d40bdf1b4339 SHA-1: 7df881cd030a764ac5fedc4de8d83d714d2a20f7 SHA-256: f37f1b2e2092bf64c64373773300237a58489e65487dbb6930ccc1330cf97bc8
130 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising a "Free Robux" generator. The document body also contains text and links related to this lure. The presence of embedded links and the nature of the lure suggest an attempt to trick the user into visiting a malicious site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-now-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
font_00_sfnt_off0000339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x339E 26796 bytes
SHA-256: 60f602488b0f727fa1b96be128d0a74c6ffc82294dc970449250f7bbfb7491f4
font_01_sfnt_off00007111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7111 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00007db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB9 18180 bytes
SHA-256: 347d9824d8825d818282a285fba00b3bd41d7299fa84866cfa8bfb70561977b1

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