Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a94065de045796…

MALICIOUS

PDF

35.0 KB Created: 2021-07-09 11:28:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6c6856ab85b2c2d1e0b62975984a4040 SHA-1: 18541753543b587a4a743fbfafc6894189ed4bb6 SHA-256: 49a94065de045796ba5f3d86f12cb7aeb42f36f42cec7cd2bbf942f93018cc10
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free spins'. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-for-today-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/coin-master-free-spins-and-coins-for-today-game-hack In PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/games-that-have-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-roblox-accounts-with-obc-lifetime-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-promo-codes-pastebin_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-hat-generator-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/walking-trhought-wall-cheat-engine-meme-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-free-robux-hack-without-human-verification_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-cheat-codes-for-elemental-war_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-cheats-for-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/flee-the-facility-hack-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/como-tener-robux-gratis-en-roblox-si-hacks_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-much-robux-can-you-get-with-1-million-dollars_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_002_off000031cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CD 22964 bytes
SHA-256: 512e9fcd458da6887a9b024af8209a80ffdd49a01d455186939987050665f88e
font_01_sfnt_off0000655f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 18528 bytes
SHA-256: 64e6d113bd97b02afb7632d7b1c85a61d3fc47f14b318ce8b72a94cd305839a3

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