Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc5343501b1db3…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 22:55:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1b6e61433560d72852b4d168d4c0c759 SHA-1: ca5c913274ad712ed11572fbb6acb3040d136488 SHA-256: 1fdc5343501b1db3ce9ffbb2c1daa962f3919dcdbe755822b7d136c09e30c5b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically targeting users interested in game-related cheats and currency. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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 https://netcdn.xyz/app/431946152/roblox-redeem-card-codes-free-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/robux-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/is-minecraft-bedrock-edition-free_GM479516143.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_003_off00004789.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4789 27440 bytes
SHA-256: f6d57990cc2f98aee3f8ee7f3c15409e8b1922f0d8837daf23ea1b79c015812f
font_01_sfnt_off000083b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B0 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9058 18612 bytes
SHA-256: a80930eafb0fa49b70c8b74e6f01afa17dc8341ac3dd6991c9bc21ab4de62243

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