Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c16a3390cd8610…

MALICIOUS

PDF

49.1 KB Created: 2021-06-03 18:19:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b718813a60ce20e439a45e7ba90c2036 SHA-1: c8a04a897e88ba9d684dbad7ced9efe325df431c SHA-256: a8c16a3390cd86106f21cfbb5ad751b724535637ee89b287d3f242813541e589
160 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors, specifically leading to a lure for free in-game currency. The document body and heuristics confirm the intent to trick users into clicking these links, likely to download further malware or lead them to a phishing site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/free-robux-no-human-verification-or-survey-or-download-2021-game-hack In PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/is-uc-pubg_GM1330123889.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.talakeel.com/uploaded_files/userfiles/files/robux-hack-free-robux_GM431946152.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_004_off000053fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53FC 30048 bytes
SHA-256: 584e0ee7f23338a7f4dd4bce4fac54861ecfa8e62100ee93f7d62764061c964d
font_01_sfnt_off00009809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 20136 bytes
SHA-256: 66e5e50e12f5eb49621ab9bcd6ab85026409d616512a452c1eb3339dd9867554

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