Malicious PDF — malware analysis report

Static analysis result for SHA-256 14231c27b8611ed0…

MALICIOUS

PDF

43.2 KB Created: 2021-05-11 21:36:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f089469241baac84a9eea892c6292e66 SHA-1: 1800bea583b96c0a6d950d5075535a2af0e4b7d1 SHA-256: 14231c27b8611ed0b6ef65786c784bbabaec76ba2d0cae8575b78643e30872a6
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 0.9648

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/free-coin-game-hack PDF link annotation
    • https://cogp.greentrade.org.tw/image/data/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/wurst-hacks_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-minecraft-worlds_GM479516143.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_off000047cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47CD 24380 bytes
SHA-256: 6b857606d211f36fc90fcc24798d4b3df36a43818884840096fb6fe1d6e728ed
font_01_sfnt_off00007f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F41 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000088f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F3 17380 bytes
SHA-256: a4bb5aa59a0895550ef87f0e1f62a241b9a4a4255add019176508325e4cabc72

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