Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9306d943e62856…

MALICIOUS

PDF

53.8 KB Created: 2020-08-07 08:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 704c85124e47176ba46476e9b8d36bc6 SHA-1: dc35d65e08dd727513a06cf92e6d8eb10c353efa SHA-256: 0c9306d943e62856c62e83d3e68f49a74640f131c8d01739a6f94433cec794fb
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the presence 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/wb?keyword=free%20radical%20addition%20reaction%20of%20conjugated%20dienes%20pdf
    • http://files.windhamchambersingers.com/uploads/1/3/0/7/130775027/8f035b6.pdf
    • http://jidag.sealylionsclub.com/uploads/1/3/0/7/130776449/813221.pdf
    • http://gowevesuk.envchemgroup.com/uploads/1/3/1/6/131606349/1247702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4945/8591/files/betezevikeregowogemi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/xobevixotafawazixawerepo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/92040555631.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/bonfiglioli_as_series_gearbox_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/28171167290.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/gakiju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5650/files/auto_tune_efx_crack_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/bafuxoxagodivawexiser.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/53368330605.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/vamakez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/vetunemesibiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/98791215664.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_off000089ed.bin
7405713f975c6a9e26aec8ab9ae064284b417907ed6985b32129ce5499dd02a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x89ED 5356 bytes
font_01_sfnt_off00009c3d.bin
337d6fd0c988307adc0350d36764e93f7272675086d3526ae2329f4554b792b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3D 14748 bytes