Malicious PDF — malware analysis report

Static analysis result for SHA-256 626165daea83ec0e…

MALICIOUS

PDF

35.6 KB Created: 2021-07-01 09:06:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 21e747e86e74193d96b7342708e54720 SHA-1: 184a0e7105c7ec4dacc32bd3ed13a41bbb9838be SHA-256: 626165daea83ec0e1ee02ea9ca7888f6e39725a118c32c401054549dc65ccfee
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising game-related cheats and free items. The primary link directs to a known malicious redirector infrastructure, suggesting a phishing or scam campaign. The document body and heuristics indicate a focus on SEO-driven link farms pointing 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.co/app/431946152/how-to-get-free-catalog-items-on-roblox-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-cheat-exploit-juillet-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/comment-etre-un-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-needs-more-space-but-1tb-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-without-having-to-download-anything_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/murder-mystery-2-roblox-cheats-free-elite-and-radio_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-human-verification-no-surveys_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-download-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-do-u-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/pokemon-go-free-rare-candy_GM1094591345.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-in-less-than-10-seconds_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-script-hack-2x-luck-bubble-gum-simulator_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-commercial_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
font_00_sfnt_off0000335c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x335C 22492 bytes
SHA-256: 9569f1d6736807a0ca148c7bc74f0e53313216513f97544c0fc7d1f65340aa72
font_01_sfnt_off000065aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 19176 bytes
SHA-256: 4e8e514c744c806f1606ee3ec8fecb89f22f2398bd0b75dbe62b167c188ec404

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