Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f10ae795337d63…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 09:27:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6230946473b191430a33b1c5e1bae491 SHA-1: e37000e91e59ef7a73c16b1c7784be5157d473e5 SHA-256: a3f10ae795337d63ce4cc9df33c073d8846f801f30b72734c44c921e10867535
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 0.9769

Heuristics 5

  • 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.
  • 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.online/app/406889139/how-to-get-more-spins-on-coin-master-for-free-game-hack PDF link annotation
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • https://www.italisaitaly.com/uploaded_files/userfiles/files/how-to-hack-coins-in-archery-master-3d_GM406889139.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_004_off000053a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A5 25548 bytes
SHA-256: cdef99575d994fc06ea230dd6700e2fd61f70752156d98973f71af586d87bb75
font_01_sfnt_off00008da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA4 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9756 18052 bytes
SHA-256: fa2464eaebfb8d03ead71eceb596d04c94d28f156e1826a2469de3cf6995c318