Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb991a0cde3cee08…

MALICIOUS

PDF

39.9 KB Created: 2021-05-13 13:30:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e78e97e3e516a4cc90ee44bd6cf084d3 SHA-1: 184dd140988020b9618af1e35c2ddac9632cde38 SHA-256: bb991a0cde3cee085e149334247038233ec8a1986e320cea20c469b71ec7f3b2
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector URL. The document body also contains text and links related to 'Coin Master' game hacks and a call to action to download. This indicates a social engineering attempt to trick users into visiting a malicious site, likely to download further malware.

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/406889139/get-free-spins-on-coin-master-2021-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_off000035df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35DF 26940 bytes
SHA-256: d15d816980c777cb1acdc5d37c22d737d79217f5ade05b6c030d32f1fe9847fa
font_01_sfnt_off00006fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 18288 bytes
SHA-256: 51edae499e96af11139ef94313efcbf906f73cd888d739ca20624da83f1b55af
font_02_sfnt_off000091de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DE 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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