Malicious PDF — malware analysis report

Static analysis result for SHA-256 39941397692c467e…

MALICIOUS

PDF

45.1 KB Created: 2021-05-10 23:00:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b81edb4a97606e25c714b18642f67911 SHA-1: dc92452ba98cb050dc61660c9b574976d63bca00 SHA-256: 39941397692c467e693c4436b29c0d6ad8e56e7cfdc31f2a570346ea7a309144
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn serves further malicious PDF documents. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-free-link-blogspot-game-hack In PDF document text
    • http://elsenorcafe.com.co/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/worst-client_GM479516143.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elsenorcafe.com.co/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C4B 31320 bytes
SHA-256: a3f9471d5344218a7f885083701666e670de4f38de10fd2d3fe6e05c13ea5f2f
font_01_sfnt_off00008d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 18632 bytes
SHA-256: 25a48d095538c21b3574d128913f1d88808f27fbb4560e17bb648f934a14342e

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