Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae427f3d7a1f673…

MALICIOUS

PDF

37.1 KB Created: 2020-08-27 13:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2b11dfde95325eddc65a38a0f1900a SHA-1: e9f6f44a2fce4a8a198e701efee7a5b2468baeb4 SHA-256: 0ae427f3d7a1f673d913e7baee08a3a975bc73223022c2097b598306c52d53d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.ru/pify?keyword=bookman+antiqua+font as malicious. The document body, though heavily obfuscated, contains references to this URL, suggesting an attempt to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=bookman+antiqua+font
    • http://zakabox.extratimeconcierge.com/uploads/1/3/0/7/130775565/fc095a32a7.pdf
    • http://mejar.nutterscrossingcommunityhoa.com/uploads/1/3/0/9/130969130/b7a4bae2c.pdf
    • http://vuxez.sofieball.com/uploads/1/3/1/1/131164250/jodaboxodinatesev.pdf
    • http://xokagof.mijunktiquescollection.com/uploads/1/3/1/4/131453870/1616453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/4468/0359/files/azkoyen_zen.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3934/files/analytical_chemistry_skoog_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/1416/7450/files/67173127965.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/apa_itu_anoreksia.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/losoponedipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/tegobos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/5031661539.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/87553389812.pdf
    • https://cdn.shopify.com/s/files/1/0462/7093/9293/files/31884424560.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/divina_commedia_con_note.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/chicken_farm_business_plan_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f68.bin
c68032ebc5c39a4d2774086778fecd0885397d0c54a2088ba6b81c348d28e026
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F68 4844 bytes
font_01_sfnt_off00005fde.bin
9215963532cd3e182cf59987d44ddbb8b0ee007e6472b367d43d2dd6853b6de1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 11972 bytes