Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd871bac65d4700…

MALICIOUS

PDF

36.6 KB Created: 2021-05-21 12:33:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5bdfaefee66241c1fcfb2a1264f9bbde SHA-1: 1d7eca29946a3445f38ac2d50fc6f05841f7de63 SHA-256: afd871bac65d4700025df07e45678cb868a150919bab4f1e8e36c96c0e81058e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that lead to a known malicious redirector infrastructure, disguised as a generator for free in-game currency. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a lure for game-related cheats, which is a common social engineering tactic to drive users to malicious sites.

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/406889139/free-coins-coin-master-blog-game-hack In PDF document text
    • https://www.mvp.co.nz/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.mvp.co.nz/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.mvp.co.nz/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mvp.co.nz/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mvp.co.nz/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C1 25008 bytes
SHA-256: 7c5ae7e9e4959e4627ea00130073bea2160f2c79f8d84b3e5045c74bdf317bb9
font_01_sfnt_off00006da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA7 18288 bytes
SHA-256: 525699ae71861fffeab431a07c950b4914d38a871fb98becad0e0bea9ac3f1df

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