Malicious PDF — malware analysis report

Static analysis result for SHA-256 145e6ab07066dda0…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 10:00:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4d2419a2df2560dab1f5ae4eb2fe05f9 SHA-1: 29b67f44979701a100d01756e18b17f951b57ed6 SHA-256: 145e6ab07066dda0ca6ccd2777437ec16bdda02fbfacf092176ea0e11be3fe15
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 0.9980

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 http://netcdn.co/app/406889139/coin-master-free-spins-for-today-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/how-to-hack-levels-dragon-ball-z-revelations-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-promo-codes-august-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/farm-world-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/cool-roblox-outfits-for-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-glitch-builders-club-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-be-a-creeper-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-updated-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-person_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/lingojam-roblox-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-hack-tools-download-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-alt-accounts-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/redeem-roblox-promotions-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-skywars-coins-hack_GM431946152.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_002_off000032fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FA 22648 bytes
SHA-256: 9bb3e31a2a5dd99af3089fab7187d3da9563f741cb589f56f993a48a24441b9c
font_01_sfnt_off00006586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6586 18528 bytes
SHA-256: 611292c7b78d9aef83f236a5f61e8588922333099173db31565d3b831f2ee55a

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