Malicious PDF — malware analysis report

Static analysis result for SHA-256 a925350530f6082e…

MALICIOUS

PDF

39.9 KB Created: 2021-05-20 07:28:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ab42e7f2b5ef06ee5cacb4b37de67203 SHA-1: 5f13755175a68daa7ec795428ca317a860b1c311 SHA-256: a925350530f6082e7ddd3d8dfae043a1da03d59e5c598dd96dff76ea464833d6
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and in-game currency generators. The primary lure observed is for 'Pubg 40 Uc Buy', directing users to a known malicious redirector. This suggests the document is designed to trick users into visiting potentially harmful sites, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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.
  • 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/1330123889/pubg-40-uc-buy-game-hack In PDF document text
    • http://calavera.be/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-coins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.midasbuy.comIn 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_002_off0000413d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x413D 25236 bytes
SHA-256: 3ba7cc546c37ef354e390aeef2f8e6d149144882661428ca136d0e6e4b547f34
font_01_sfnt_off000079a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A6 18312 bytes
SHA-256: 8d11b2c7c085417c45012e7e089edc1fec31195e87346459e8ef83fd24d19087

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