Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3905c7a1b16b8d…

MALICIOUS

PDF

36.1 KB Created: 2021-07-07 07:39:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5814011dc647fd8b7fabece5f97362e7 SHA-1: 1bf44af9355110d38a3d2e7a333f4965d2002b68 SHA-256: 0d3905c7a1b16b8d1a0e4626f27295be9d1f8bfea2ccccb4f166e827b7166ddc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and further malicious PDFs, masquerading as game hacks and cheats. The document body and embedded URLs strongly suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-2021-game-hack In PDF document text
    • http://foo.com.tw/files/exploit-hacks-2021-counter-blox-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/cheat-in-roblox-free-robux-pc-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-online-free-no-sign-up_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-codes-youtube_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-how-to-get-free-items-in-catalog-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-those-who-remain-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-com-roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/hack-in-roblox-bloxburg_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/pokemon-go-free-coins-hack_GM1094591345.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-links_GM406889139.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_off0000349e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x349E 23368 bytes
SHA-256: 5728c96ddec000afacd30b7454c5eb21dcafd22ae1fe09978c867f18e1b2e14b
font_01_sfnt_off0000698a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 18576 bytes
SHA-256: a126babb65047b6746617d7d7f27a00b485a4a24246b96e57b4b97a03add53e0

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