Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c7467cc8187cd8…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 12:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2abce36916d819f919e925077af96316 SHA-1: 9ff4e29006c4dce6ee0cba4280d907733fa62f9a SHA-256: 07c7467cc8187cd82ad6d6093c12b33eff7eb3886741c9b527da300b55850f39
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains the URL that leads to the malicious redirector, suggesting an attempt to drive traffic to malicious infrastructure.

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=corrugated+roof+sheets+galvanised
    • http://files.leazahbehrens.com/uploads/1/3/0/9/130969360/kusomodazijop_bobisiw_vikagawoxi.pdf
    • http://puwujal.rushhourbiomedical.com/uploads/1/3/1/6/131606349/8135866.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/58209404301.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/44466553454.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/48278454083.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/neguvewev.pdf
    • https://cdn.shopify.com/s/files/1/0447/2481/3977/files/john_deere_322.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/amplitude_and_period_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/xoregaxasokirifefite.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9101/files/birejuxagewinukulabikax.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_off000062e6.bin
28d12d3b73a684d1b83f39b1b0c6a4c91de9cbf52bdb4cdb50bbbfe67709b50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 5136 bytes
font_01_sfnt_off00007464.bin
c5327d7077bc839ec80ec6402307462ce59058bdaedfcf7f2519dbb502b03758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7464 10456 bytes

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