Malicious PDF — malware analysis report

Static analysis result for SHA-256 a594e39e1c12be61…

MALICIOUS

PDF

47.4 KB Created: 2021-05-18 02:40:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d479a0e249aaf6409de82a9f09028dcc SHA-1: 0e3ad071a6210a855664189857e6d8866e4e1f36 SHA-256: a594e39e1c12be61a447defdd3f0f1ee1977c97adf9361d16bd5f6c72906e42d
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • 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.
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-gift-cards-game-hack PDF link annotation
    • https://billiekawende.com/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://billiekawende.com/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://billiekawende.com/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://billiekawende.com/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://billiekawende.com/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://billiekawende.com/images/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • https://billiekawende.com/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://billiekawende.com/images/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://billiekawende.com/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • https://billiekawende.com/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ee7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE7 26296 bytes
SHA-256: 001427f37ad7120caed7888ce2d454ca18d4954936b9eb1b60a74313a306a667
font_01_sfnt_off00008aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACA 2972 bytes
SHA-256: fe1b64b9eb208bd08d0f8bfa63e14d484da307fb8ec7450e4681975ddc03d50e
font_02_sfnt_off00009507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9507 18804 bytes
SHA-256: db707177e1a0df533614fd289cf2b470ee37edf039339bb568c3977480a042bc

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