Malicious PDF — malware analysis report

Static analysis result for SHA-256 8316838f4e842a37…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 23:09:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0f17e9c0d5c1de57e00e10f6b755c698 SHA-1: c8b4a3f4e1b30cc4518d39deaeb4acffe86131be SHA-256: 8316838f4e842a37741edea823ded35d48a26ef5eb24252eace591bfa677a224
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector, disguised as a generator for game hacks and free spins. The document body and heuristics confirm the lure is for 'Coin Master' and 'Roblox' related cheats. The ML classifier strongly indicates maliciousness, and the presence of multiple redirector links points to a phishing or malware distribution attempt.

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-links-for-free-spins-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/how-to-sell-a-clothes-roblox-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-card-number-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-how-to-get-free-robux-proof_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-esp-cheat-engine_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/app-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/tsarsploit-hack-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-4-free-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-cheats-fr-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-streets-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/artmoney-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/change-your-birthday-to-this-date-for-free-robux_GM431946152.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_off0000327b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x327B 22164 bytes
SHA-256: 8be478c8e0e98499dd3d2369cb68106a32f3756059a08516aec5353d65d61ce8
font_01_sfnt_off000063c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C4 18344 bytes
SHA-256: 6ad1108e81c5525844192ddb13ab38111abd218b87fc7994796a13e0178d8bfd

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