Malicious PDF — malware analysis report

Static analysis result for SHA-256 c543de7961f3698f…

MALICIOUS

PDF

35.9 KB Created: 2021-07-06 07:08:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a1e8e74810a6eb508c4f15f6d59dfb7d SHA-1: 3e8b90b7efd1f1b8603b9e591debf4f23933af6c SHA-256: c543de7961f3698fc7f539097a0f3aa0acf75b22272ae6b849c9d7fbac53292a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and IP addresses, all masquerading as game-related content like 'free generator' or 'hacked accounts'. The ML classifier strongly indicates maliciousness. The document's primary function appears to be directing users to external resources that likely host further malicious content or exploit kits.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/hacked-roblox-accounts-list-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/how-to-cheat-in-roblox-2021_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-free-gift_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-baton-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-hack-menu-apk_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-promotion-codes-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-for-roblox-project-pokemon_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-roblox-gift-card-pin-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/cheat-pekalongan-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/comment-hack-un-compte-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-buy-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-de-roblox-para-atravesar-cosas_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-infinite-robux-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/hack-roman-aegyptus-roblox_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_off0000353f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x353F 22312 bytes
SHA-256: b4208981f866886703b7804bc3218edac2ee4e8b90cf625993dd851a80f53297
font_01_sfnt_off000066ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 19196 bytes
SHA-256: 381610bbab0b7b31e380a7a4918c50b3e30c1fbe9436aeae15edec1864da4a24

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