Malicious PDF — malware analysis report

Static analysis result for SHA-256 40abc67f7520f768…

MALICIOUS

PDF

54.2 KB Created: 2020-08-03 14:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe633d570f167dacf57575aaa35b624 SHA-1: 9fc52b5b084d7884e3266647f04b435e244c2d84 SHA-256: 40abc67f7520f7681efd03de989147b9324e5cd0a1b36115bd8709dc3b58c769
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and numerous benign-looking URLs hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, limiting the analysis of direct payload delivery.

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.ru/pify?keyword=assainissement+des+eaux+us%25C3%25A9es+pdf
    • http://files.shirazgermanshepherds.com/uploads/1/3/1/0/131070529/696497.pdf
    • http://files.versus.band/uploads/1/3/0/7/130738779/sasuweti-pawofi-jowuseliluvif.pdf
    • http://files.romelocaltourguides.com/uploads/1/3/1/4/131407823/nedidokowi-suvexufuxofet-zisif.pdf
    • http://files.fenwickberryfarm.ca/uploads/1/3/0/7/130739646/gifed-jujegimilori.pdf
    • http://files.kfritzdesign.com/uploads/1/3/1/4/131437750/bce26fc6f229.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/bejirabizifepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/im_all_yours.pdf
    • https://cdn.shopify.com/s/files/1/0436/0152/6948/files/pathfinder_scaled_fist.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4103/files/42010145060.pdf
    • https://cdn.shopify.com/s/files/1/0432/2908/5859/files/ditusuzijizalevati.pdf
    • https://cdn.shopify.com/s/files/1/0438/3129/6160/files/holistic_approach_to_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/76777617022.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/warugedoriso.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/26949565507.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/watch_real_housewives_of_atl_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16216600544.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/nagitiwikirepux.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/56765658940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/69649048839.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_off00008467.bin
e6b5ce4fbb79a9161f80cb6646b48bb2357732d6220e7d2ed0c7da7dcf9e979d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8467 5032 bytes
font_01_sfnt_off00009523.bin
fd37350dbd17c67528364fde2bc79bbfc134dd5c0e442383ecbd4dd8d3ded2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9523 12360 bytes
font_02_sfnt_off0000bb7b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 4324 bytes

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