Malicious PDF — malware analysis report

Static analysis result for SHA-256 7362830adbd50de3…

MALICIOUS

PDF

50.2 KB Created: 2020-07-19 05:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d658614cbead4a5f77f489476d3c3cca SHA-1: 56c52f44172f170ed1fdcb3b63121c12e1fab5ee SHA-256: 7362830adbd50de395de2c4b84b799f5bb09738d721d800c387da20f43d91d3a
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to malicious content under the guise of academic papers. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm strategy. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/wb?keyword=cambridge%20primary%20checkpoint%20past%20papers%20science%20pdf
    • http://files.jmccartney3d.com/uploads/1/3/0/7/130775001/sajeperuke.pdf
    • http://files.woodbrookhuntponyclub.com/uploads/1/3/0/7/130739690/fanatemagesepoj-wuwofimet-jawemopuz.pdf
    • http://files.christchurchduanesburg.org/uploads/1/3/0/9/130969548/69706697ceb.pdf
    • http://files.4-ucorp.com/uploads/1/3/0/7/130739567/7385382.pdf
    • http://files.srgchi.org/uploads/1/3/2/6/132683400/77358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/87996293202.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43106273748.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/24811009795.pdf
    • https://tokatoxosi.files.wordpress.com/2020/06/60160119905.pdf
    • https://wafosagejam.files.wordpress.com/2020/06/21506366659.pdf
    • https://lemobiruwira.files.wordpress.com/2020/07/95589310115.pdf
    • https://tumolodiku.files.wordpress.com/2020/06/demesobejefe.pdf
    • https://dipajar.files.wordpress.com/2020/06/siremadexizigewiwafet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/90599650707.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/nubixisid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/zesusinupunaxenigekebegub.pdf
    • https://cdn.shopify.com/s/files/1/0432/3681/9104/files/41618515598.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/61211114868.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/kunopajimanimuguda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/wisokomepimisemin.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_off00007d02.bin
e6fa15e467433f7ce9ec2a3208a3e817466faba3d7b30a3520aef0a2a862424f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D02 5652 bytes
font_01_sfnt_off0000901b.bin
1a2665e45a898d1b20f154869f5f9ddcb0e47eca8c8daf7ad16f3963ca34eb0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901B 13428 bytes

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