Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7c8b1a315b132c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 12:00:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a1ba1e7fa16ff2f8effb306ae5101dc2 SHA-1: 7e43d47218026669a96ef5bc89cc6bb7ade826fc SHA-256: fd7c8b1a315b132c7cd4a4c2f26da611fc1d4ef95d6a71e41b345a4c9ada7ac8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a redirector URL, which is flagged as malicious. The document body and heuristics indicate a lure for 'free generators' or 'game hacks' to entice users to click the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/coin-master-hack-app-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/redeem-roblox-cards-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-clothes-on-roblox-without-bc_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/unlimited-robux-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-in-roblox-on-phone_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-reeden-code-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-como-hackear-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-cbx4-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-asset-download-for-t-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/robux-hack-free-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_off000031b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B4 22888 bytes
SHA-256: 3a27c427a2e5f10f50a0781340f8de7d4a6b9b14ba6b4778f0287ee6515d33b8
font_01_sfnt_off000064fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 18180 bytes
SHA-256: 5b637a8a036eab97bffff91a515cae84fc40b6bddd589e778cc2e69a12b03167