Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8bcba62ae27bca…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 19:47:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4cc83c2261c23dc55d2b7f9a7e535c6b SHA-1: 3543a092fae87409a9f11945094bbbbef892c1ae SHA-256: 6e8bcba62ae27bca0a04e4f2a595bfb52fed82d9f26d99492974d743d42cc640
220 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and a link farm, indicating a phishing or scam attempt. The primary lure appears to be related to game hacks or generators, as suggested by the URL and heuristic firings. The document's structure and embedded links strongly suggest it's designed to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.online/app/431946152/7-year-old-roblox-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/pubg-uc-wallpaper_GM1330123889.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-redeem-code-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
font_00_sfnt_off000049be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49BE 25876 bytes
SHA-256: 08e18de4780caf25015d1282afb8919d796a5e6901d42e01a822e20bf28d8aae
font_01_sfnt_off000085af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AF 18404 bytes
SHA-256: 37225de3c02ebdb31c4d59be1a78a7ea60948fb78f91d5b0c72323347af89c0d

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