Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3266bd589fa1c2…

MALICIOUS

PDF

44.1 KB Created: 2021-05-11 16:01:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b387452c8ed9cf5c4faa3ad148e85f3f SHA-1: df845d0a5d10bb650970150745971a11f6a1bb03 SHA-256: 8b3266bd589fa1c209c99913614e4bb36dd613dd8f80a196631aa97e61e4fdaf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on game hack generators and free item offers. One critical heuristic identified a link to a known malicious redirector infrastructure, and another indicates a PDF link farm. The document body, though partially obfuscated, contains a URL pointing to a 'game hack' generator, reinforcing the lure. The presence of multiple embedded links suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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-free-cards-2021-game-hack In PDF document text
    • http://mycookingpot.com/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D61 26384 bytes
SHA-256: 7de84d238b8769ba50c17a4803c755f5de74f6ca4fe5e853e25130ed7b816f48
font_01_sfnt_off000089f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F6 18288 bytes
SHA-256: 1103c1a9052967993c67e1ec6a20b7963a45820bc749ae4085be8aaf66ba1d93

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