Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f2a4c73902e8af…

MALICIOUS

PDF

47.0 KB Created: 2021-06-04 07:23:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 229e59c285eedea676640d5a9fe32b82 SHA-1: 0a41306d122c0f130f349b30e8a0c2732947f7d7 SHA-256: c7f2a4c73902e8af3c428d8c9bbb35271acaab74da9ac5330d4a618c31745853
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, including a primary link to a known malicious redirector disguised as a game hack. The document body and embedded links suggest a lure for users seeking in-game currency or cheats, which is a common phishing or malware distribution tactic. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/gun-simulator-hack-roblox-game-hack In PDF document text
    • https://library.fdk.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005070.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5070 26056 bytes
SHA-256: 1f866b29adb6ad9563641915958f8be553503ebf7e0ab9f226ce98c1cd4e6660
font_01_sfnt_off00008d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 2880 bytes
SHA-256: 680cee9962ed9b8340f32eb4497b4a869b674082cb72c24c089fa73c4597fa7a
font_02_sfnt_off000096e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E1 18808 bytes
SHA-256: 67fbed25c3aa9a2a992970ea8e647640bb3410fe185652324d650dfbc51b488e

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