Malicious PDF — malware analysis report

Static analysis result for SHA-256 5859dbd6ac6937dc…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 17:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4f09fb1fbf3ca3ef1729051a30366a4 SHA-1: a1661d1a7b97bba903fe98923929fdeb9b542fbc SHA-256: 5859dbd6ac6937dc95db3e38742f5e595ed3db2cf3c96dffe816ed579273c3cb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=functional+anatomy+of+brain+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=functional+anatomy+of+brain+pdf
    • http://files.larysspeakeasy.org/uploads/1/3/1/0/131070792/volulorapeb.pdf
    • http://files.michael-montoya.com/uploads/1/3/1/0/131070581/5617511.pdf
    • http://files.shutterday.org/uploads/1/3/1/8/131856883/9ff23c589b1.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/23771443353.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigazisamakolomomabixefox.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2423/files/15256843447.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/28545926385.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/digital_fundamentals_10th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/82281910885.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/tikarujusomagamagisisivas.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/63140420428.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/54218273667.pdf
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/2822669439.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/tupokivojimutedaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/88027464502.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/supetexubanemesuziw.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006585.bin
fda84231d2e8ffbb77eaeba31924d84573b43bcf10f007597ef02e9c6f9074fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6585 5320 bytes
font_01_sfnt_off0000778d.bin
1ad378eee9ee38b0c1321d1cdf2340bf64e66662f6212b915fd2364b18d317ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 9936 bytes