Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6b07612cd1e790…

MALICIOUS

PDF

35.9 KB Created: 2021-07-04 02:15:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 60a2fd959ce59acecfc8bd4c0f3a4ee0 SHA-1: ac5cc64c48b825a2086ea264c65f3568d56a50b0 SHA-256: 8c6b07612cd1e790ec2e3c69a885320767e675fc86772c6eca337f8562c608d6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to websites offering game hacks and free currency, such as 'master-free-spin-and-coin-links-html-m-1-game-hack'. These links are associated with malicious redirector infrastructure and are designed to trick users into visiting potentially harmful sites. The document body and heuristics indicate a lure for free in-game items, a common social engineering tactic.

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.tw/app/406889139/master-free-spin-and-coin-links-html-m-1-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/pokemon-go-free-8-generation_GM1094591345.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-a-persons-roblox-account_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-para-counter-blox-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/play-roblox-free-online-login_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-bloxburg-tips-and-cheats_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/tiktok-free-view-followers-app_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/pokemon-go-free-stuff-codes_GM1094591345.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/10-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-pe-server_GM479516143.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
stream_002_off0000342f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x342F 22968 bytes
SHA-256: 84595943b56371f7d937643cf1cd36c05d1f46314eacef1c2a8a95c4c5a85bce
font_01_sfnt_off000067ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FF 18956 bytes
SHA-256: 85e071f9d2d9aba7decae53ba293d7c98952cf6adb5dc147492857e3bbfc39de

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