Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2526451c320a15…

MALICIOUS

PDF

62.0 KB Created: 2020-09-02 06:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e02597ff09289ed0253e1007e5eae7f SHA-1: 149ad640ee0aa4a5ecca167ad6230387b0823d9a SHA-256: 2a2526451c320a15fb79903ae2f89cbf033e191b4470ea12caebaf6a603c40e2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=libros+de+robotica+para+ni%25C3%25B1os+pdf+gratis'. The document body, though partially corrupted, contains similar text, suggesting a lure related to free robotics books. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier 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.link/wix?keyword=libros+de+robotica+para+ni%25C3%25B1os+pdf+gratis
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/74153577347.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/76831335229.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/29159530879.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8725/files/50303166149.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/57492589274.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/kijesariviwamujuza.pdf
    • https://cdn.shopify.com/s/files/1/0438/0075/6385/files/nature_sounds_alarm_clock.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/xiselutujogumasogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/perepanekapugewisis.pdf
    • https://cdn.shopify.com/s/files/1/0438/6321/2192/files/business_intelligence_and_analytics_systems_for_decision_support_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/rojotemez.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/human_psychology_101_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/wadapizaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a64c.bin
a26227db865afe7eb6295095b6dd3805406cf307312ed56b3dd730e384db5731
pdf-font-stream PDF embedded font (sfnt) at offset 0xA64C 5584 bytes
font_01_sfnt_off0000b909.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 1800 bytes
font_02_sfnt_off0000c199.bin
16ffc8bbc6e1a465be2e5e3461c626523f52986440f1ecaa3b0dd6be28608d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 11800 bytes