Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8650ce1bc52b259…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 22:51:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6b31fdb9a8ac48514c1ed9b2304affe9 SHA-1: 6d365c0af41a610cbc3ca765f57b68c57c23aef5 SHA-256: a8650ce1bc52b259d162296d012972ea5bb284b84fd7c3aaf8e2fb2a2ffb812b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing 'game hack' and 'free generator' themes to trick users into clicking links. The primary link directs to a malicious redirector, which in turn hosts numerous other PDFs, likely serving as a link farm for SEO poisoning or further malicious redirection. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-quick-and-easy-game-hack In PDF document text
    • http://jasperfirstumc.com/images/roblox-hack-day_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://jasperfirstumc.com/images/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://jasperfirstumc.com/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://jasperfirstumc.com/images/roblox-fly-hack-not-a-virus-flood-escape-2_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://jasperfirstumc.com/images/2021-promo-code-for-free-robux_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://jasperfirstumc.com/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://jasperfirstumc.com/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jasperfirstumc.com/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://jasperfirstumc.com/images/coin-master-hack-download-apk_GM406889139.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
stream_004_off00004eaf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EAF 26480 bytes
SHA-256: ec7b91650a36f46904cb88b7f5ce9ce06ddb88bf37edd76d435a00bb34695679
font_01_sfnt_off00008ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE6 19312 bytes
SHA-256: 8864302c4376247ebc5e6278f314ad8e27dec13469d3c620c44a8705dc74853a

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