Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53fbf3778194772…

MALICIOUS

PDF

34.6 KB Created: 2021-07-08 18:38:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4fb3d6a3a0840c53f8fbd3ba02b2f07c SHA-1: c85fd0d98818f199a77a49ff3c66364bc2b012e5 SHA-256: b53fbf3778194772bfeff48c0bf1207bd45c97c02bfff0e0c9c0a989b1cd1b66
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a generator for game items. The ML classifier also flagged this PDF with high confidence. The document body and embedded URLs suggest a lure for free game items or hacks, which is a common phishing tactic to drive users to malicious sites.

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/479516143/minecraft-toys-for-free-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-items-on-roblox-with-inspect-element_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-admin-commands-dll-hack_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-nowcom_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-sites_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/100-free-spins-coin-master_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
font_00_sfnt_off0000328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328C 22768 bytes
SHA-256: a0b9fb7c1f3e5d82474a255a6bde7e77d1e30cf3612e05e993173b2e5a388822
font_01_sfnt_off000064f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 18180 bytes
SHA-256: f81bb2f2fd86575a0e0f0902236f9c8512641ba003de241774aa63060d9f6659

Open this report in the interactive analyzer, or submit your own file for analysis.