Malicious PDF — malware analysis report

Static analysis result for SHA-256 724d99d3b593e794…

MALICIOUS

PDF

53.7 KB Created: 2020-08-10 19:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c4bbc88d11e19fac03b72ea579ebb2c SHA-1: 014c822f848f0154f7506bc1e9990d3e5861851f SHA-256: 724d99d3b593e794a43e222f7079172e216de29c35513cde40526a0b6650f22f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a malicious intent, likely to direct users to malicious sites or download further payloads. No scripts were extracted, but the link farm and redirector are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.ru/pify?keyword=american+english+file+starter+pdf
    • http://files.srwcmilwaukee.com/uploads/1/3/1/4/131453615/3663311.pdf
    • http://files.nbpsrc.ca/uploads/1/3/0/7/130740077/3622438.pdf
    • http://files.patdbuchananeportfolio.com/uploads/1/3/2/6/132695302/lumifokimotutokevez.pdf
    • http://jawud.baytalmosul.com/uploads/1/3/0/8/130874359/9885738.pdf
    • http://files.houstonprimaryschool.com/uploads/1/3/1/8/131856435/7834098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/cadbury_annual_report_2020_17.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/30008320567.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/13653479125.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/65991702521.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/40420568387.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/stardew_valley_lucky_lunch.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/48943004258.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/14481051742.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0405/files/komuru.pdf
    • https://cdn.shopify.com/s/files/1/0436/8649/4361/files/antenna_theory_analysis_and_design_4th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/ropurebijujarimurug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000099aa.bin
6c2e2c239e3e01c4158261ff1ecaba86ccfb3964ef1d8e4424a830f99394d788		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x99AA 25784 bytes
font_00_sfnt_off0000632a.bin
401b6814b95d99e1b5308b72689080102dfdb38bb79fa582576231ba08dac890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 5556 bytes
font_01_sfnt_off000075d3.bin
b48b21dfddbae4d66dc3b8e3a333cf5dc519c02d641cbd7f0488a27026eea76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D3 10636 bytes

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