Malicious PDF — malware analysis report

Static analysis result for SHA-256 7343c82b5151803e…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 23:15:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bbdc2983a0f8394ea6ef6e7662ff5528 SHA-1: 09ab81dfb4ed86849695b9396c6db38bc7901d2d SHA-256: 7343c82b5151803ecde199c25fc0b03030828607e688f30906e22fa8a024830a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including a primary redirector URL associated with malicious activity. The document body and embedded links suggest a lure related to game hacks and free generators, a common social engineering tactic. The presence of multiple SEO-optimized PDF links indicates an attempt to distribute malicious content broadly.

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/406889139/coin-master-daily-spin-link-game-hack In PDF document text
    • http://signsglasgow.co.uk/images/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/robux-match_GM431946152.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://signsglasgow.co.uk/images/coin-master-daily-spin-free_GM406889139.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_003_off00004ae6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE6 24740 bytes
SHA-256: 7a16714220b1999ec53f29e372f82ceee31bf4dd62fd31643d38fd4cbd02dd62
font_01_sfnt_off00008393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8393 18316 bytes
SHA-256: 5f3aa979c0c75b9e9bcded1c8d551e9f9e6ead33f385895e7850a31af22003f0

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