Malicious PDF — malware analysis report

Static analysis result for SHA-256 a258ce7fcaae3202…

MALICIOUS

PDF

47.1 KB Created: 2021-05-14 15:47:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bb141823e85f88404ffda84df6034cae SHA-1: 8719d3af339a2634719f86ec8e08f20cd7bcaa61 SHA-256: a258ce7fcaae3202c39184df5b309908b2bbee183c94e6582dc911968c856bae
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 0.8948

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.xyz/app/406889139/how-to-hack-coin-master-2021-game-hack PDF link annotation
    • https://morishita-tc.com.tw/image/data/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-today_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-rewards-link_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_003_off00004bd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD8 28236 bytes
SHA-256: 256405a51e9e3ef0db0d4b617831d39e8b812617b2ea29e6ead41236b143d025
font_01_sfnt_off00008bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF7 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off00009597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9597 18284 bytes
SHA-256: 2ae8d3f2cbcae8cb3753deb1cb0690858b25682b169ed1ca9b91685ca7cd6d7f

Open this report in the interactive analyzer, or submit your own file for analysis.