Malicious PDF — malware analysis report

Static analysis result for SHA-256 f360dcb54e284ac8…

MALICIOUS

PDF

32.2 KB Created: 2021-07-04 07:49:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c2a299106ab38b3469072e1c148ff1d2 SHA-1: a62f9f63e86961ffb0f4467565bdd2f9116c4726 SHA-256: f360dcb54e284ac8f4c83329815a36a924463fe55d3530cbff9de99ec7b83621
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting "free Robux" generators and game hacks. The document body and heuristics indicate a lure designed to trick users into clicking these links, which likely lead to phishing pages or malware downloads. No scripts were extracted, but the embedded URLs and redirector firings strongly suggest a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-get-free-robux-for-free-game-hack In PDF document text
    • https://au-ma.com/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/2021-february-roblox-noclip-hack-for-prison-life_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/easy-robux-hack-on-android_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/pubg-uc-nasl-alnr_GM1330123889.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-and-tix-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-hack-into-someones-roblox-account-on-phone_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-death-zone-hacks_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/cheat-engine-roblox-jailbreak-speed-hack_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-without-getting-apps_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-2021-july-inspect-element_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_off00002a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A27 21488 bytes
SHA-256: 84adc26c5612cfbde17489faf0f0ceca8e609d3090c131339e59753165d16554
font_01_sfnt_off00005931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5931 18984 bytes
SHA-256: b02f235e187ca63825268846ce24859b9c73d6f06522f0e44481555b58ecada8

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