Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d39bd493f60523e…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 19:43:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4cb9083ceec1deaa9dd1be345fdbd321 SHA-1: 3e9cf70f329c223cec74a92129aee7e35a04875e SHA-256: 7d39bd493f60523edf144aa604dbc05ec56206c4c6bac779ee7aee460487d705
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/robux-websites-2021-game-hack PDF link annotation
    • http://pdia.de/images/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/robux-survey_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/coin-monster_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://pdia.de/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pdia.de/images/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://pdia.de/images/how-to-get-free-robux-com_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_off00004810.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4810 24288 bytes
SHA-256: a01bdcc3e456fa10f7febfe94b00b0ffaabbfedaaaf186ed1bc2a7f7531278d7
font_01_sfnt_off00007feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEB 18676 bytes
SHA-256: 8e35f60a006eed5ffc493481045aa1980878ced5d77eb8f37738a10bc05aa5ba

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