Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fc38345f7ba0b6…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 07:36:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f4fb9c2c2222bb737cc09c3285aec063 SHA-1: 3ed125415d714b9cc6dcb1e87abf5ae3d0618ade SHA-256: 17fc38345f7ba0b6f23841df30d92c3c8977ba756f32a08587b1451af2954e16
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appear to be game hack generators and free currency offers. These links lead to known malicious redirectors and a large number of SEO-optimized PDF links, indicating a link farm designed to drive traffic. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-hack-extension-game-hack In PDF document text
    • https://invertsports.com/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://invertsports.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • https://invertsports.com/images/claim-roblox_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://invertsports.com/images/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://invertsports.com/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/minecraft-servers-that-allow-hacks_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_off000048bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BF 25288 bytes
SHA-256: 859223958fd8c0359d3bf55ab7a25397e12b79a0c04c7144dbf46852df5e06c2
font_01_sfnt_off00008355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8355 17924 bytes
SHA-256: 4ec806a11ea658252867691d695683eda87cb09c7a2cbc5226fdb095b6c4840a

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