Malicious PDF — malware analysis report

Static analysis result for SHA-256 54518eaf2b5c901c…

MALICIOUS

PDF

42.7 KB Created: 2021-05-10 21:01:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 088f0aae6d4b0d449acdb37d69f53b4c SHA-1: ba1457c44e3d623bf12037d8eee87c3d5c430b5d SHA-256: 54518eaf2b5c901cf54943b808d06788826e840dd5d0726823bf361fdef1e708
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically designed to lure users with promises of free Robux and game hacks. These redirectors then lead to a large number of SEO-optimized PDF files hosted on atiltd.com.tw, indicating a link farm or content-spinning operation likely intended to drive traffic or distribute further malware. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-robux-without-verify-game-hack In PDF document text
    • http://atiltd.com.tw/upload/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/easy-robux_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • https://www.communes.comIn 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_003_off0000487c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487C 25764 bytes
SHA-256: 6f4372bbad84e9f3440d8f7138a678958d461857aea96df5d281ee4ab9e8b32d
font_01_sfnt_off0000829f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829F 18916 bytes
SHA-256: 511fbd4ba16aacf51779f52d01f2fc894dffaba514ce449b994b41b42032bc0e

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