Malicious PDF — malware analysis report

Static analysis result for SHA-256 887f6441276a7d0c…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 01:52:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8b25e39ab35a898d360a8a7b4bb8214e SHA-1: 6ad6807c420300137401f1b01a5d2f5232179943 SHA-256: 887f6441276a7d0c09069f69695a20ee4b51871f31c5fef2a5289d020ae6a002
82 Risk Score

Malware Insights

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

The PDF document contains lures for game hacks and free in-game currency, directing users to external URLs. The primary URL, http://netcdn.tw/app/406889139/coin-master-free-spins-link-2021-game-hack, is associated with a game hack redirector. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a potential for exploitation or redirection to malicious sites, aligning with common phishing and scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-2021-game-hack PDF link annotation
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-best-free-outfits_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-cs-go-aim-hack_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/pokemon-go-free-643_GM1094591345.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-hack-roblox-deathrun-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/robloxcom-avatar-free_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/blox-rewards_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-tiktok-coins-2021_GM835599320.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/hack-coin-master-1_GM406889139.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_002_off00003014.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3014 22260 bytes
SHA-256: d6b3d48005e0327b550aad717777c8d93fa24e2f17baf50c012734e1155abb0c
font_01_sfnt_off0000617e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617E 18748 bytes
SHA-256: 785b8830476a1dba2603225cf55ebb3d3433825858fb25e5612ad86a59b30773

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