Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3b116bed94bec6…

MALICIOUS

PDF

41.9 KB Created: 2020-09-09 18:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ec9a9da15c935443352b2392ea337bd4 SHA-1: 2dc2b04a9afd7902f0ed9956b74b65d949540466 SHA-256: 6a3b116bed94bec6d1428dcf12d20f9d60b5b8cd60a33eea1f936a564d557771
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=medicare+guidelines+for+bone+density+scan In PDF document text
    • http://files.topofthepodium.org/uploads/1/3/2/8/132815748/soput-fuvakujituguno-figumuzirijujo-puxuwubazub.pdfIn PDF document text
    • http://files.cochrantonfair.org/uploads/1/3/1/3/131382808/vatodilejim-xiwesonisigupa-namugasobimat-voxemimobewu.pdfIn PDF document text
    • http://puvag.sashawrighttherapy.com/uploads/1/3/0/8/130874066/zasil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/e2b09b_d3c085842e37480f88965ad49324d233.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f17c6554e1ce4a27b2ea7a8688aa29ca.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8da65f_dadef46b78264acf9d92e0daf13f0be0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3c82afa7beb748dd8e9239a9b811b86e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0cd019_832bd17ecb324c4cb0dc47ee075b1a1e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2d007_a98e9badaab74459bd0cffd40021909b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3fc21f_fc991217a7e749ee96d39c92b433f96a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/822ecd_5a30d540010341f1aea91c6e3de6bf52.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/23e9be_1cf7374281da4a52b934f5bd6495eff4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6e3131_fc75d3ca14b84718907513136233203f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/912de2_4fe9f0ea40ff407fb07b0f276cc35441.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/754d94_68fad89361724b07a1824efe560770e4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 5436 bytes
SHA-256: ec0799cd1ccbcdca14effc0da92fda78a2a4e956e629004eacbc41884de72882
font_01_sfnt_off000076e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E1 10788 bytes
SHA-256: 80a250138752e84f4cecf49bbe79882846bc50e09dacbf991b1da5d396a37200

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