Malicious PDF — malware analysis report

Static analysis result for SHA-256 6614fa000e523a5b…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbda45abd47065c27ddae8bdeac0de3a SHA-1: a874133189af31fb1c539bbef61f7bc82fac28ac SHA-256: 6614fa000e523a5be9858946922360b8b5e78f4396dbb358e1373fbb280b906a
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to a redirector service, indicating a link farm or redirection attack. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic firing for 'PDF_MALICIOUS_REDIRECTOR_LINK' suggest the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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.cc/pify?keyword=pdf+books+marketing+management
    • http://nawibowal.reimaginerunnemede.org/uploads/1/3/1/0/131069839/7526907.pdf
    • http://files.aroundandbackagain.com/uploads/1/3/0/9/130969768/bogutaposeman.pdf
    • http://files.minniefairytales.com/uploads/1/3/2/8/132814791/a8971e09.pdf
    • http://files.royaltysflame.com/uploads/1/3/0/8/130813042/9066034.pdf
    • http://files.seomid.com/uploads/1/3/0/9/130969389/vikili-sezaz-kazeroto-zifuvixedowek.pdf
    • http://www.fotolia.com''gt;Fotolia.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8815/0690/files/gudovewilarexozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/2087913062.pdf
    • https://cdn.shopify.com/s/files/1/0438/4463/2738/files/47360567257.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/fomosekeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/47354998539.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/31692325864.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1908/files/zafop.pdf
    • https://cdn.shopify.com/s/files/1/0438/0740/8290/files/68889172395.pdf
    • https://cdn.shopify.com/s/files/1/0433/6133/7494/files/23300590849.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/1805989733.pdf
    • http://www.fotolia.com
    • 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_off000062f4.bin
59ebb3bf4a01922fc6e0e06a6bd9d1564a72bd5e8de55b9f2a57ae8a1679ea15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 5400 bytes
font_01_sfnt_off0000753c.bin
ce56d90c41f0380cd0a63e3387d2e978e859ba366ce596be2164da2f686220a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 10220 bytes

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