Malicious PDF — malware analysis report

Static analysis result for SHA-256 d898cbf5c8b8d086…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 13:30:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef233041afeaf9be171c127b2beffa5f SHA-1: beade225513220e512207b25f39f7e692f9559bd SHA-256: d898cbf5c8b8d08624234d6cb2a30f022794d7971280894cd9f43bcfe3f9806c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are part of a link farm designed to lure users with promises of free game currency and hacks. The primary redirector URL is http://netcdn.tw/app/431946152/robux-hack-no-verification-game-hack, which is flagged as malicious. The document body also contains this URL and other links, reinforcing the lure. No scripts were extracted, but the overall structure and content strongly suggest a phishing or scam attempt.

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/431946152/robux-hack-no-verification-game-hack In PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-accounts-2021-with-robux-bugmenot_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/is-pokemon-go-community-day-free_GM1094591345.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-roblox-for-robux-201_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/jack-hack-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-powergrip-gauntlet-roblox-parkour_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/robux-games_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-cheat-engine-no-viruses_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFA 22044 bytes
SHA-256: b48583ea1ae7c56692172eb0abd6d2368a417f2995cadaadc50b39d2dea0e9a2
font_01_sfnt_off00005f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9D 19080 bytes
SHA-256: d232f6da93b975725b0e6de4d1ead99b7c862a359b76aa44f8f2076ca8d9907b

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