Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d02e32f51c69c3…

MALICIOUS

PDF

44.7 KB Created: 2021-05-16 01:36:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 36050b3e8704d6079455da1b85471074 SHA-1: 99c72644f84b38062c54d0820fada799fcc94d5e SHA-256: 26d02e32f51c69c31f61179f511508a67ef2552787b88f06cf943aeae960b2de
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous links designed to lure users to external websites, masquerading as generators for game hacks and free currency. The presence of a malicious redirector link and a large number of SEO-optimized PDF links suggests a campaign to drive traffic to potentially malicious or ad-filled sites. The ML classifier also strongly indicated maliciousness.

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 https://netcdn.xyz/app/406889139/hack-coin-master-ios-download-game-hack In PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://elman1td.sam73cyber.com/__statics/gudangsoal/files/promo-code-free-robux_GM431946152.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_003_off00004e39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E39 26660 bytes
SHA-256: d80fd44753181cfebde8b01c896abdade77bab2e2c027ffc1b73d9bc065f6a2f
font_01_sfnt_off00008c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 18296 bytes
SHA-256: c3a7aa5493d9c78280f09be9b3dea50c99c9ca557e957bef37f4f4a03af25bda

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