Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89b677c267ba486…

MALICIOUS

PDF

45.8 KB Created: 2021-05-13 23:08:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a1370ecd116867f47f1d781556ad4bc2 SHA-1: 779163e3612592375dc6d984d45efd3c471a0a51 SHA-256: f89b677c267ba486f7e8e2f6a08beae8c47f54d600b13e8a397e0a18c5a4bc92
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are presented as "free generator" or "game hack" lures. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains references to game hacks and URLs that reinforce the lure-based attack pattern. No scripts were extracted, but the presence of multiple malicious links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/479516143/wurst-hacked-client-game-hack In PDF document text
    • http://apx-centre.ru/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/robux-sites_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/robux-earner_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.freenom.comHeyIn 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_003_off00004c40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C40 25740 bytes
SHA-256: bc289a232f9a871187b8b50364efd5de14e0a672cf666ead837b3ca3bfff14d7
font_01_sfnt_off00008630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8630 3128 bytes
SHA-256: 801f6fa60decd1add2f223f91580103c35e150c924465f86a7a572b3e00674f9
font_02_sfnt_off0000906f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x906F 18324 bytes
SHA-256: c0530dae0908aae9c65ae0320e7c709be86d077002ac81f35dce260cac78bd58

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