Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a73727f17fd4ac…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 08:53:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 22e300927e9940d1bdd5fe5baed1f105 SHA-1: 577b7d5c9afa39183d6719ad31146c35aa16d697 SHA-256: 31a73727f17fd4ac75e08412b6fa0a645060ac9483864899aa4ea1a6218e8e57
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure victims into clicking on what appear to be game-related hacks or generators. These links lead to redirectors and a large number of other PDF files hosted on link farms, indicating a phishing or scam campaign. The ML classifier strongly supports the malicious nature of this PDF.

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/how-to-get-free-robux-without-downloading-any-apps-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/counter-blox-roblox-offensive-free-esl_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-game-cheat-engine_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts-2021-with-robux_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_off00002d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D75 22568 bytes
SHA-256: b50a91c9ca05b861034b221927041b37cababfbb897e16a51d7ea87c9c71db75
font_01_sfnt_off00005fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE6 20240 bytes
SHA-256: 297e40e48bf98f909157546786ed8ef6c846caf78719244298106c3264496c18

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