Malicious PDF — malware analysis report

Static analysis result for SHA-256 6180b30a18528bdb…

MALICIOUS

PDF

41.5 KB Created: 2020-08-24 15:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 724e0220e525951f870ad519d5c0c350 SHA-1: 9d30144bb102665907797a55a82ae46919c22856 SHA-256: 6180b30a18528bdb8ec9aa88532a63ec81273f192e01ed08fd2b6c4de39ddda4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that points to a redirector, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the link farm and redirector are strong 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.com/pify?keyword=bitbucket++zip+archive
    • http://files.drcarterscourses.org/uploads/1/3/1/3/131384429/1077953.pdf
    • http://files.wentworthplaceva.com/uploads/1/3/0/9/130968933/wobiwogitu_zubamiligifo.pdf
    • http://bofav.fabulousdesignsbybella.com/uploads/1/3/1/4/131407178/20c785c1e901fac.pdf
    • http://bupus.grammar4.mrslambsroom.com/uploads/1/3/1/6/131606968/2c043.pdf
    • http://files.ohiodistrictaljc.com/uploads/1/3/2/6/132681150/fazonapowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/7.pdf
    • https://cdn.shopify.com/s/files/1/0429/4678/9542/files/wiedmin_bestiariusz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/74414747740.pdf
    • https://cdn.shopify.com/s/files/1/0430/1081/8201/files/autodesk_inventor_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6197/files/79124826559.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/30043923033.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/49782404430.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/60600861895.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/dovedegorevejerepizowak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/fuderero.pdf
    • https://cdn.shopify.com/s/files/1/0435/6174/6595/files/turn_off_automatic_sign_in_gmail_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1932/files/84132353790.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_off00006465.bin
cbb3d65c35e17619786c35acb42639f8be6522ade536b2f373866bb297637661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6465 5172 bytes
font_01_sfnt_off000075ff.bin
765c836ef44d0586fac596d3e1eecd07c4787309e08a702145ed3b6d80972392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 10248 bytes

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