Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e40d97cad9c23e…

MALICIOUS

PDF

42.8 KB Created: 2021-05-10 23:07:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aaa9063e2a585cba5350071e7a670ec1 SHA-1: 1a225ec2a9dbb2c31cce257091191f57b4648262 SHA-256: f5e40d97cad9c23e3c35585b0b86ebe04e20ce8286c26aebff0d97d6bc9f2a4d
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 0.9971

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/roblox-redeem-robux-game-hack PDF link annotation
    • http://www.htc.edu.au/images/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-free-coins-2021_GM406889139.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_003_off000048c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C5 26088 bytes
SHA-256: c2f0ae6c92c4401ee779014ffa1ceb1af46dd9402a794fb5c1f84f3c52edd89b
font_01_sfnt_off000084c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C3 18356 bytes
SHA-256: 60b0283a47b11a7d3b079aa48626d1b3d5c159be2a1d49f12e6aacb8ef7f92ad

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