Malicious PDF — malware analysis report

Static analysis result for SHA-256 f763ea2a5afb17a3…

MALICIOUS

PDF

48.8 KB Created: 2021-06-11 08:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 652a859cb5574fb3593b604bc528778e SHA-1: c56fba3007df4e3591e84be063cb73c5a3e41e38 SHA-256: f763ea2a5afb17a34178f6a8df9277f21c461051adbc34c7ca1e0f84233b50b1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector, that are designed to lure users into downloading or visiting sites related to game hacks and free spins. The document body and heuristics indicate a clear intent to redirect users to potentially harmful content, likely as part of a phishing or scam campaign. No scripts were extracted, but the embedded URLs and redirector findings are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-roblox-pictures-game-hack In PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/where-to-put-scripts-for-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-make-hack-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/cheat-names-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/freerbx-info-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/roblox-google-chrome-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-to-hack-into-someones-roblox-account_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_off000053d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D3 27168 bytes
SHA-256: 9e1c51f7637d0d230025af565726dd684c748fa3a4da988e0ca42a65941381ed
font_01_sfnt_off00009221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9221 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00009bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC2 18464 bytes
SHA-256: 180a4ad17c1f23e4ca76edb290e31517124eefabcfd2de992d1b247c5afe37d8

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