Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1f1e681b90a88a…

MALICIOUS

PDF

49.8 KB Created: 2021-06-03 06:47:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5450292ca2b9e9707ac1fda86bc892c7 SHA-1: 0b70cc92389520f65fc55f5d10b5f2c814679cd3 SHA-256: 9a1f1e681b90a88a4cbd6d84218b0506c0981a69ebfb2e6050347eebe30ade58
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are associated with malicious redirectors or link farms. The document body and heuristics indicate a lure for free game currency or hacks, such as 'free Robux' or 'Coin Master spins'. The primary intent appears to be directing users to potentially malicious sites that may host malware or engage in phishing, rather than executing embedded scripts.

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.online/app/431946152/how-to-get-free-robux-2021-game-hack In PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/tiktok-free-views_GM835599320.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/pokemon-go-free-apk-download_GM1094591345.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-vip-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-robux-codes-2021_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_off00004fec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEC 28320 bytes
SHA-256: 04bef28c9565ee1529e01a42e4cf2eb4ec4ebb9a127ae958092dde458d2ab7b6
font_01_sfnt_off00009168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9168 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7A 18684 bytes
SHA-256: 662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5

Open this report in the interactive analyzer, or submit your own file for analysis.