Malicious PDF — malware analysis report

Static analysis result for SHA-256 686a015e28afe5bb…

MALICIOUS

PDF

39.0 KB Created: 2020-07-12 05:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9553cbdec13857875e4b3df8fa918602 SHA-1: 8b23500812bd6385cc21c8bd645259bd692da2a6 SHA-256: 686a015e28afe5bbd65597aa0a700f39278d565ab979ffe6f8ce7f093e554f2b
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to a redirector infrastructure. The document body and heuristics indicate a "free download" lure, likely intended to lead users to malicious content or phishing pages. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.ru/pify?keyword=london+street+map+pdf+free+download In PDF document text
    • http://files.reading2reading.com/uploads/1/3/0/9/130969555/49253ecafb.pdfIn PDF document text
    • http://files.jjjohnsonauthor.com/uploads/1/3/1/4/131437268/lotoxaboxubuw.pdfIn PDF document text
    • http://files.ajeplanners.com/uploads/1/3/1/4/131406816/sifojopese_nidukuzinagimo_xutokajofuzi_roxurugar.pdfIn PDF document text
    • http://files.daysinnepal.com/uploads/1/3/2/8/132815385/2164140.pdfIn PDF document text
    • http://files.familycounselingandcoaching.com/uploads/1/3/2/3/132302966/2566390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://povunefuw.files.wordpress.com/2020/06/53314719779.pdfIn PDF document text
    • https://ladubine.files.wordpress.com/2020/06/49182673446.pdfIn PDF document text
    • https://jijafozivofi.files.wordpress.com/2020/06/ripafakepatatumuwixer.pdfIn PDF document text
    • https://xabofufutin.files.wordpress.com/2020/06/49694228349.pdfIn PDF document text
    • https://dunawudawoma.files.wordpress.com/2020/06/raletojoxedomudel.pdfIn PDF document text
    • https://wezosufetela.files.wordpress.com/2020/07/rudamafugisuzes.pdfIn PDF document text
    • https://tanutukezod.files.wordpress.com/2020/07/14030946638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/94684023887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/60825281319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/86287643547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/47983837682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94229011204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/43567852658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/89766314261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1348/8292/files/bibidaxel.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_off00005bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB5 4960 bytes
SHA-256: a00bcd0724b3318221ced03d47d3be4c198cfe7eda23670033670285ab77f547
font_01_sfnt_off00006c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8C 10124 bytes
SHA-256: 1cfde839857863cb455550f47b331b687977ad1c87be208130daafda9cc3252e