Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb16a2a170a157c…

MALICIOUS

PDF

42.2 KB Created: 2020-10-12 03:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: fa256dd786da5da05dbee021144562e6 SHA-1: e22328aa386e1a6bafb1fe8cfa26033861b581e5 SHA-256: ffb16a2a170a157c82950612b83a5a5283d5c1429493649dfc131310407ed560
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.club/pify?keyword=6-2+practice+parallelograms+answers In PDF document text
    • http://files.karineandreassen.com/uploads/1/3/0/8/130873736/tedukugawiz.pdfIn PDF document text
    • http://todibopu.charlestoncob.com/uploads/1/3/1/4/131453648/rivarugef.pdfIn PDF document text
    • http://niwaje.rochestermfa.org/uploads/1/3/0/7/130775189/jizonifuralimux.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/63484574322.pdfIn PDF document text
    • https://site-1048575.mozfiles.com/files/1048575/98383234129.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/vomutosuvemewamituzefe.pdfIn PDF document text
    • https://site-1036840.mozfiles.com/files/1036840/1663475109.pdfIn PDF document text
    • https://site-1043373.mozfiles.com/files/1043373/gazitegotokatoravokaxinev.pdfIn PDF document text
    • https://site-1039815.mozfiles.com/files/1039815/wevinurat.pdfIn PDF document text
    • https://site-1043406.mozfiles.com/files/1043406/pejutawiwitiwamagolozo.pdfIn PDF document text
    • https://site-1040386.mozfiles.com/files/1040386/motaruvukawutotimonowez.pdfIn PDF document text
    • https://site-1039638.mozfiles.com/files/1039638/gosevuruke.pdfIn PDF document text
    • https://site-1037267.mozfiles.com/files/1037267/54547107381.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/1/0440/7204/2661/files/pupij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7827/0628/files/72218948149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3197/7370/files/geometric_series_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7666/7542/files/68405888986.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_off000062dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DC 5568 bytes
SHA-256: a47b9188b96a8d028fd06dbe310ffdec672fcd90723812e7e195ebe388eb6c13
font_01_sfnt_off000075c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C5 11272 bytes
SHA-256: 779650fdcb62f50686756516b15e9bbd8e2094103cfdfc5c0694e6356843d84e

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