Malicious PDF — malware analysis report

Static analysis result for SHA-256 782e91077bfc1581…

MALICIOUS

PDF

49.9 KB Created: 2020-08-23 21:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 565f7d5418ef9c9cd8bcf4e6ad109cf5 SHA-1: fcc286503c1966f23b40cbb7dca0b31623dd15d1 SHA-256: 782e91077bfc158172a462b9ae36bc79b93a781f146ca49e1516e0df93ed1e2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, indicating an attempt to lead users to harmful content. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and a URL that appears to be part of the lure.

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=payroll+management+software+free
    • http://files.wesleyantheology.com/uploads/1/3/1/1/131164156/jilow.pdf
    • http://tajebiwe.tessacase.co.uk/uploads/1/3/1/4/131407241/ecffad.pdf
    • http://files.donaghtruaghcommunityemployment.com/uploads/1/3/1/1/131163540/4ec11493.pdf
    • http://pawat.xcores.org/uploads/1/3/0/8/130814229/zozegixasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1320/0278/files/sufulugatodafilefafobu.pdf
    • https://cdn.shopify.com/s/files/1/0450/3309/5326/files/uses_of_computer_in_different_fields_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/consequentialism_and_non_consequentialist_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/fitawozenaxejobirog.pdf
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/27964825706.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/vevoterixizeneperasapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/velakepitunuxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071f8.bin
78baf08ae1f7028da374d641f6ed7b34ff5e18849381752a0e1ab50b9016e555
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 5280 bytes
font_01_sfnt_off000083ee.bin
10a181e6ada3dce382498c39bb4adaa6cd1e70955ce9e6f91983d39c6825b2f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x83EE 9800 bytes
font_02_sfnt_off0000a5b0.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B0 16144 bytes