Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86b6fa077398c34…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 13:18:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2d7885dc9d0710789709a3b374b1ca5e SHA-1: 17b293eb01a729e35dce58e360b4e66cc2715467 SHA-256: f86b6fa077398c346688194030b3e44312a6d47899e8149ab41ab7786de39517
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-robux-scams-game-hack. The document body and extracted URLs indicate a lure for free game hacks and currency, aiming to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or scam 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/431946152/free-robux-scams-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/roblox-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-granny-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-egghunt-2021-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-make-developer-products-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-pastebin-code_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/tiktok-free-view-year_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-cheat-engine-bypass-2021-super-power-training_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/biulders-club-robloxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-spin-links-coin-master-october-30-2021_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
font_00_sfnt_off00002d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7E 22624 bytes
SHA-256: a083cb291b859c4c72a2b4b675f49884ed90a09f21b1ba14a6e0b80afd588c4b
font_01_sfnt_off00006040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 18976 bytes
SHA-256: 48eef6298bef607355aca425a8072928fe0e0a0bc0ee660e64f251d9c93ff6b2

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