Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7c98063ed5403a…

MALICIOUS

PDF

72.7 KB Created: 2020-08-12 18:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26dff16dea7cbb4dc23a86faf986e40b SHA-1: bfdf627cf5dec04a3b13498a5c10264027d5396a SHA-256: 8f7c98063ed5403aa799e6067cbc98992f6a54a6cd73d50937bc2d808858b5e3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a seminar PDF. The primary malicious URL identified is https://ttraff.cc/pify?keyword=libro+de+seminario+de+cultura+regional+de+chihuahua+pdf, which is likely used to redirect the user to a phishing or malware-hosting site. The presence of numerous Shopify URLs suggests an attempt to blend in with legitimate content.

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=libro+de+seminario+de+cultura+regional+de+chihuahua+pdf
    • http://files.bondkitchens.co.uk/uploads/1/3/0/9/130969004/jadojitamupese-dapajabubojoxa-fetepex.pdf
    • http://files.donellestaples.com/uploads/1/3/0/7/130775084/dodetuxibu.pdf
    • http://files.liviyahansen.com/uploads/1/3/1/4/131453555/7142373.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/osrs_max_hit_calc.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/90173123626.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/8030269247.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/72294369987.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/69966482596.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/69362326023.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/zafovefuvib.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/vemagido.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/pulp_fiction_synopsis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/online_converter_to_jpg_with_high_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/18007872131.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3710/files/negivowasapawogupemit.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/14183103734.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/
    • https://cdn.shopify.com/s/files/1/0437/5884/6

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da49.bin
b3f14c54fa4c95f290637280834e602dfdeb753a2173565ffdbfc9132b273aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 5652 bytes
font_01_sfnt_off0000ed4d.bin
b9b6b87deb0c76cfad60ee51a84b55b4eefa1f4ac4ff2910ae8da2de26cace96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 12536 bytes

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