Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cd8d560af949f1…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 21:29:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3cc3521b8b75c8685410e9462547a7cf SHA-1: 8aa0fc143ec9d03d1ebc27bce54d32ea8d532d01 SHA-256: 73cd8d560af949f10bf32b4c10679efe504e57f13337c5037abb7b22a2358084
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, including a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-gold-cards-hack-game-hack. The document body and embedded links suggest a scam related to game hacks and free currency, likely intended to lead users to phishing or malware download sites. The presence of multiple SEO-optimized PDF links further indicates a campaign to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-gold-cards-hack-game-hack In PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-hack-on-roblox-on-skywars_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robux-hack-with-required-password_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-piano-hack-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-robux-birthday-glitch_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-cool-free-items_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-hacked-pour-avoir-des-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-no-human-verification-no-download-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-apocalypse-rising-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-anthro-paid-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/techindroid-hack-download-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-images-free_GM479516143.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
stream_002_off000033b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B5 22536 bytes
SHA-256: e7917d23923a2b1ee73745e8aadc64e4cf14b3f5f4116513f7246b7024f23157
font_01_sfnt_off000065f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 18252 bytes
SHA-256: 86d208c87cd9723521760f39289724e0803f9f68e91a8c51082ac7ab23afa3dc

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