Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b45d57cef08755…

MALICIOUS

PDF

51.7 KB Created: 2020-08-22 21:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d7bc204c3658f961342afe7f31e58c SHA-1: 8b90dc8ad55b87cee18098f4c1d5f0ec59b1a66e SHA-256: 61b45d57cef087555ea08aacac035cbab30a58cfc2609c23b49877109803f240
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting an attempt to disguise malicious activity as educational material. The PDF also contains a large number of external links, indicating a potential link farm for SEO manipulation or to distribute further malicious 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=editing+exercises+for+class+5+with+answers
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1111/2092/files/resinonuxubojisobaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/12926650680.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/donuwigami.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/reading_worksheets_esl.pdf
    • https://cdn.shopify.com/s/files/1/0441/3983/9640/files/zapubugolupejivezotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/peberuli.pdf
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/9768498480.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/gedumu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/partitioned_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0447/1724/4570/files/owners_manual_ford_fusion.pdf
    • https://cdn.shopify.com/s/files/1/0446/3758/5571/files/reason_for_leaving_your_last_job_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokisesuzarutaxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/sintesis_de_los_lipidos.pdf
    • https://cdn.shopify.com/s/files/1/0434/2631/6455/files/vi_show_line_numbers.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_off00006f2c.bin
7316396226bf7ca561c2b538841d34c7cca89197bc1b2d256ab33597531eb9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2C 5524 bytes
font_01_sfnt_off0000820c.bin
7a862813a8291912c96151799fae7ea588663d427e7b028acbd5ecfb15325f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820C 13160 bytes
font_02_sfnt_off0000ac01.bin
cebb2ee4632955a3019f478c3ddd6797fe6f3065e568267a52f4b079fd487fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC01 16224 bytes

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