Malicious PDF — malware analysis report

Static analysis result for SHA-256 837fa04566fa19f8…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 10:48:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 442e96628100212315803efd14152000 SHA-1: c939cbffec2b6a9d90389528a05452b209037894 SHA-256: 837fa04566fa19f88f589354bd58b75183aca2220f9c7400bca536062821aa5d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. The primary link redirects to a known malicious infrastructure, and the document body itself contains multiple URLs pointing to similar lure pages. The presence of these links and the ML classifier's high confidence score indicate a phishing or scam attempt, likely intended to lead users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/roblox-hack-me-robux-2021-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-skywars-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-csgo-hacks_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-profile-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-a-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-do-u-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-use-cheat-engine-in-roblox-snow-shoveling-simulator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/buy-for-free-roblox-builders-club-classic_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-roblox-items-for-free_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_off00003025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3025 22440 bytes
SHA-256: 4b5e7c2f5706abba50a91e5aae1d0b148a7478b9d62c53370b991dee138144d9
font_01_sfnt_off00006231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 19392 bytes
SHA-256: de6eb87b8d8f43f2f1f9f03da2a46f5a98e94a691618e226009cc80bf62a8848

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