Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd03644ddd6ae46a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 14:32:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2e213c06d0a2dfc22b6a46590d95027a SHA-1: b2d7fe70458a0ef0f69ad5d9e181189508984f7d SHA-256: dd03644ddd6ae46a4128d223dbc624dc21027a94dae47a7b7d072a84e3455ebe
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with malicious redirectors and link farms. The document body and extracted URLs suggest a lure for game-related cheats and currency, likely a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leading to further malware downloads or credential harvesting.

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-free-spins-2021-today-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-wild-savannah-inf-health-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-2-player-tycoon-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheat-roblox-skin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-hack-no-verification-legit_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/crashed-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-for-money-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-no-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-jeans_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-2021-blogspot_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_off00002eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB4 22768 bytes
SHA-256: 0258b077b9b0ddd8d8af1ed4310a7fd87f47249769f81d5a94f459a7d9f5a01f
font_01_sfnt_off000061de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 18928 bytes
SHA-256: 36a48a759b81b87537c08b2d93e7ece15db90ec581655e2887e19df272526279

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