Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ece48c9b7fba57d…

MALICIOUS

PDF

52.3 KB Created: 2021-05-16 11:36:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b5f3b3b5092877affe62ed313d7df935 SHA-1: a9b2deedc3ea6a2c63b80094f1383db8f4f49a1b SHA-256: 1ece48c9b7fba57d58860224819a31e1d64e7d062d70f7742a4507ee8663a93d
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 0.8656

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/431946152/robuxy-com-free-robux-game-hack PDF link annotation
    • http://cadcam.no/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://cadcam.no/images/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://cadcam.no/images/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004716.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4716 25724 bytes
SHA-256: f0460d855e32008f967667f995007c3b4425ae88360823971c0fb1921d6802d3
font_01_sfnt_off000082dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DD 3964 bytes
SHA-256: f6b9a386ee4e0aff622a98b2230905da71eab0ca98398cb52018fda3528d3e2a
font_02_sfnt_off00009040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9040 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D46 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_04_sfnt_off0000a939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA939 18452 bytes
SHA-256: 502ad6067225007cfeab5155f8ca615546b56d7ab4478b734f537abd02c25d18

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