Malicious PDF — malware analysis report

Static analysis result for SHA-256 707d859814aabb6d…

MALICIOUS

PDF

46.0 KB Created: 2020-07-30 15:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2529d3d4b786b23c2e580c18b09315 SHA-1: 589bbe7f8a04dd22d9d17c6a80aac44df5cd3fa0 SHA-256: 707d859814aabb6d295522b8052a5b6f7f2e0fec3c4f082cdad2de068b7c3f83
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or lure users to malicious content. While no scripts were extracted, the presence of numerous links and the malicious redirector strongly suggest 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.ru/pify?keyword=erasmus+plus+programme+guide+pdf
    • http://files.7daysnyc.net/uploads/1/3/1/1/131164431/1561639.pdf
    • http://files.annemariehouy.com/uploads/1/3/1/4/131407898/db2d9bd1e77d.pdf
    • http://files.chillicothefcg.org/uploads/1/3/1/8/131857983/rolufinisuwi-jibewonebiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/89378499914.pdf
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/88862865612.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/luxadefajuxesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/podixedabilixekowolujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4411/files/53626506734.pdf
    • https://cdn.shopify.com/s/files/1/0435/5542/2369/files/romadaxurobugimenimasigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8673/2707/files/83636742428.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/76427183996.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/84092405119.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/kututezugukajelepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/7873951654.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/1050847367.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/95929746294.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/84734804595.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_off00007019.bin
59d1a21d1b415b2d89bdfd673434efa8c43695a6a67683ae742ce78e53b95c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7019 5016 bytes
font_01_sfnt_off0000812c.bin
b0aa83857b1c23cd5ae598b652739fa1fdbedb24b46e73cbce441e53583e0c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 12924 bytes

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