Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbb47e6af3c8dc1…

MALICIOUS

PDF

35.5 KB Created: 2020-08-14 18:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9004accdcef9ee05275893674e7bc965 SHA-1: 261972bee5e42c04526aaf75b06b43781a502a3f SHA-256: 5dbb47e6af3c8dc1be9b510b2d6261137dc1ff31dda5bc7d3c6048090ad00a13
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link, disguised as educational content, redirects to a known malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links and the redirector strongly suggests a phishing or malicious redirection attack.

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.com/wb?keyword=circumference%20of%20a%20circle%20worksheet%20with%20answers
    • http://kaxor.prepvisionconsulting.com/uploads/1/3/0/7/130738638/tovazixinopupe.pdf
    • http://zufatedaj.nurturenourishflourish.net/uploads/1/3/1/3/131383839/4394295.pdf
    • http://wevev.natureswondercamps.com/uploads/1/3/1/4/131452883/pubasawut.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/0/7/130739747/vunidegote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/posegitelabirunifag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/81442188694.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/zupupop.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/baruch_spinoza_livros.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/88885427950.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/university_of_bath_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/how_to_convert_to_word_document_free_download_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/72954173859.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/9510034137.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/jodani.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_off00004d82.bin
edceba7784fdaec6135637d0b8db7319f82123b9f2a207dd093972d75ace98ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D82 5180 bytes
font_01_sfnt_off00005eff.bin
f95f293f12fc75414deb84b1d5718b2272452d30ca8679ec0fa17c9b5bc8db74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 9896 bytes

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