Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e13d91672e70136…

MALICIOUS

PDF

40.8 KB Created: 2020-09-09 16:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a6849c716f581961ca41454f1c0aed61 SHA-1: 2b3f381b3db18395cfaa7c799232a842cc7b57b2 SHA-256: 4e13d91672e7013628ef2dde6b3a18ea62011dc313c2836f32a343ffd5118c28
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.me/wix?keyword=ecg+report+says+abnormal In PDF document text
    • http://files.premiumsteaksandseafood.com/uploads/1/3/1/3/131398401/05c62e5a598.pdfIn PDF document text
    • http://files.101american.com/uploads/1/3/1/3/131379724/vepenusul.pdfIn PDF document text
    • http://files.childrenofthekingdom.net/uploads/1/3/0/8/130873902/8047379.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/3e5db3_6219eb594ee44e2582826f2b15084786.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a467d2_4b87adc90f764530bbca9e10377c55cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/268ab1_2add60875d684c8abf1de8e0440c891c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/elements_of_aerial_photography.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/jio_caller_tune_set_app.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c068f8_6ef050146b264531873f90b94aa9665f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7d21c0_03b7d3623e464ac7be285fde3c05963b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_641597aefc2c4c928a52d6f2afefb707.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/62e2c1_7a7534a893f94af79347771c39df64e8.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_off000061fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 5452 bytes
SHA-256: 296c01a5e0d5bbf605bc4631b210eca3c11346295262ed8ba449410915f4b423
font_01_sfnt_off00007480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7480 10012 bytes
SHA-256: b76b1d3d304f24e4c58507d7841f1c27a0b264756b95c9268c1d38bfae154867