Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdd49229dc9df9b…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 17:28:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6bf9d1998c47db756926131ce6eb302e SHA-1: 7790f92471f918af55b5564125f748d5debaf6fc SHA-256: 8cdd49229dc9df9b5d852f28e2e1a96f97e3932cc0c17cc2b965f96b7ec72a7f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirectors and IP addresses, masquerading as 'free generators' or 'game hacks' to entice clicks. The document body, though heavily obfuscated, contains references to these lures and the authoring application suggests it was generated programmatically. The primary attack vector appears to be social engineering via a malicious attachment, leading users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/free-t-shirt-deacls-roblox-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-android-2021_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-robux-for-fre_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-catalog-hack-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-robux-credit-card-free-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/pastebincom-get-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/find-roblox-on-computer-hack-in-escape-from-the-demon_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/pokemon-go-free-lures_GM1094591345.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-tiktok-likes_GM835599320.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_004_off00005418.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5418 34932 bytes
SHA-256: 64360a9810ba3da74f7727d14bcfce5e0fa30b0a5d76bb49ecea99fbbd6d049d
font_01_sfnt_off0000a021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA021 18736 bytes
SHA-256: 3a212bbd867b2c31d453616b3a799d7d0a91bd6d1d99e4847092720d651acd87

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