Malicious PDF — malware analysis report

Static analysis result for SHA-256 16548ab990f08edc…

MALICIOUS

PDF

47.6 KB Created: 2021-06-07 01:55:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc96396dde6f01019375e691b4b6f127 SHA-1: 814fd22062300dee22e919b31a1d05567a49cedd SHA-256: 16548ab990f08edc71409ce7126c4e5a388f9e4ab86a53842325132c8fae1c97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised with lures related to game hacks and free generators. The document body, though partially corrupted, contains references to these lures and the malicious URL. The presence of embedded URLs and the specific heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/if-everything-in-roblox-was-free-game-hack In PDF document text
    • http://ines.co.rs/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/play-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://rblx.landIn 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_004_off0000508a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x508A 29800 bytes
SHA-256: e9efed3a39c98f5f6faf2cc76de1d815eb7fccaca82acdb263162a99de416e1b
font_01_sfnt_off0000947a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947A 19344 bytes
SHA-256: 9dfb1cc55b3c298ca8ccd79e4284d89544925d3fe69ff8eb4e4597431fa0404f

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