Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f21cd20d51fd58d…

MALICIOUS

PDF

66.8 KB Created: 2020-08-08 23:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e3f479470b1eecab6a6ac5dcea7cc200 SHA-1: 24c52dc0ddc0939cdd4ecfc2b97d2b9acbf5f21a SHA-256: 7f21cd20d51fd58d3419131a1c320dd845d3b8637e10520f5419648de3d37204
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.com/pify?keyword=expected+utility+theory+pdf In PDF document text
    • http://files.alamodekabashsewingshop.com/uploads/1/3/0/7/130775509/fb0d85d.pdfIn PDF document text
    • http://files.mattkurdt.com/uploads/1/3/1/4/131407877/kesazukafole.pdfIn PDF document text
    • http://files.tanasi-sharkfinguitarpicks.com/uploads/1/3/1/1/131164431/7761636.pdfIn PDF document text
    • http://files.meistertrees.com/uploads/1/3/1/4/131407152/wowakerozogos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/62480757581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/simogufojoxidagukifomuga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/a_twist_in_time_julie_mcelwain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/binaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/get_ielts_band_9_speaking_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2794/5879/files/blanket_supplementary_feeding_program.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/360_474_3296.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA786 4980 bytes
SHA-256: 22e93824890a97479df976186f898fe2a0268e042f8b1242f5be7181b6eead5a
font_01_sfnt_off0000b883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB883 14984 bytes
SHA-256: 621b37d3839895cefccfa35ddcc98f059bb80ea212df700a6fb38c073c5d5cc0
font_02_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16332 bytes
SHA-256: a7a2517a3d198e44e6445a7491ffd223c678888ca249ef9cbe0f10b189ae4f2b

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