Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a1a7e1f63d3a4f…

MALICIOUS

PDF

45.8 KB Created: 2021-06-07 10:06:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e34e37a23de91302b4f43d7b594f73bc SHA-1: 7dbb083fc751ced978704753cb83463a75e56b24 SHA-256: 58a1a7e1f63d3a4f52846d6e356de429b573b4477527d39c5bdadf6e69b03e10
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirector domains, including one that masquerades as a game hack generator. These links lead to further PDF lures hosted on a domain associated with SEO link farming. The primary lure aims to trick users into downloading or visiting malicious content, likely leading to further exploitation or malware delivery.

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/injector-hack-for-roblox-game-hack In PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-generators-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-hack-roblox-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/fly-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/rbl-robux-gives-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-cheats-com_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-free-robux-easy-no-survey_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-use-cheat-engine-on-roblox-without-shutdown-2021_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-do-i-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-theme-park-tycoon-2-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-hack-mod-windows-7_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-sprite-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-lumber-tycoon-2-how-to-get-free-money_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/dragon-ball-x-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-phantom-forces-hack-script-pastebin_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
stream_004_off0000529b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529B 27216 bytes
SHA-256: d52e522f486cfe9818fb1e0754f008d39bacf2cbb6452c965c29353c39bc865e
font_01_sfnt_off00008f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F40 18636 bytes
SHA-256: 170ac563986754ea170ae455bfaeae209a9cdbe7896817aa800f8fec8d970107

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