Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf1811e9078139e…

MALICIOUS

PDF

33.1 KB Created: 2021-07-04 16:02:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a891909d28a427c018de1800beb06b20 SHA-1: 17b39dfd650f472159b2bd316d3bde5e90abe822 SHA-256: aaf1811e9078139e5d5191bb0a5e3c8bb09f3d3b4b2a3581d15b5cdeb59d85cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a primary focus on "free coin master spin app game hack" and similar game-related cheats. The ML classifier strongly indicates maliciousness, and the presence of these links suggests a social engineering attempt to direct users to potentially malicious sites. No scripts were extracted, but the document's structure and content point towards a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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 http://netcdn.tw/app/406889139/free-coin-master-spin-app-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/cheats-for-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pubg-uc-easypaisa_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/all-of-the-free-wings-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-avtar-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-money-hack-exe_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-game-uncopylocked_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-card-collection-hack-2021_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_off00002e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8A 22652 bytes
SHA-256: 2f66951df1f51606bdb25cfea19db274601334dfac479f31ab2d2b69c3dc8d0d
font_01_sfnt_off000060f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F7 18176 bytes
SHA-256: c20278108810162b1b694c6666ef9c6da72e60db33a50c207a00b3484d1a6bb3

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