Malicious PDF — malware analysis report

Static analysis result for SHA-256 836e1a91e708a066…

MALICIOUS

PDF

65.2 KB Created: 2020-08-25 10:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07dab2a5ba05a9800e423a1b6148b1f SHA-1: 44cc02afc9c1091f9e9579db7f50ba0e26eaa159 SHA-256: 836e1a91e708a0668c1a806d933561a83d3a32c95f86dae2e90b286f27db274c
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 'ttraff.com'. The document body, though heavily obfuscated, contains the text 'Audiology infection control plan template' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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=audiology+infection+control+plan+template
    • http://files.cosmosintheclassroom.com/uploads/1/3/0/7/130775441/9ab90445.pdf
    • http://files.riversidecarriagecompany.com/uploads/1/3/0/7/130775062/tutemijo_janulezakeguw_diselasu.pdf
    • http://josus.boundfortravel.com/uploads/1/3/1/4/131406798/doximirin.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/wutogeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/weather_report_for_lisbon_ohio.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7436/files/pobejarexewuzekumijiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3317/2885/files/anne_bradstreet_biography.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magizokoluredofet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/43277124355.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/wadetapapuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/adobe_acrobat_reader_dc_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/best_free_bootstrap_4_admin_template_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9783/files/kitunesegimipovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/abel_s_driving_school.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_off0000c0b1.bin
bdd3a6dc09b56792958a1da74c51ab2f6c0bf54d9bd4b1816a607ae75e2c2a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 5388 bytes
font_01_sfnt_off0000d2f6.bin
3a67f26f65f2887c2fa7e403a324129214f98ff4a53f90b96ddd01a7f3625278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 10748 bytes

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