Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f49d9a258975458…

MALICIOUS

PDF

44.3 KB Created: 2020-08-09 06:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c26e0ca21c87fad90aea1728b7f03c59 SHA-1: 6f6ca5136baa38e553c668f9c34be87315fe9800 SHA-256: 2f49d9a258975458e79f9b3b25d1a82568749e36008d7dfb80090c3e15e877f5
150 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a link farm containing numerous external PDF links, with one specifically leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of the link farm, suggesting a lure to download further malicious content.

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.ru/pify?keyword=describing+cities+vocabulary+pdf
    • http://files.mocklerswritingworkshop.com/uploads/1/3/2/6/132695445/bda411.pdf
    • http://files.scribesjournal.com/uploads/1/3/0/9/130969695/a1da3b1707cd734.pdf
    • http://zedojof.rocksolidperformingarts.com/uploads/1/3/0/7/130776046/xuzezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/63484320538.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/nujuponax.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/that_part_schoolboy_q_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/telecharger_logiciel_pour_fusionner_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0766/files/luderel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/black_and_white_photography_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/29951643342.pdf
    • https://cdn.shopify.com/s/files/1/0435/5083/4847/files/aadhar_card_application_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/cbse_class_12_commerce_syllabus_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1159/files/kutasu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/lijonumejizojaxuzitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/roaring_20s_font.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_off00007030.bin
666c487f6b45d875aa4eb787027e2d83dff8c6c4ee12481633596abf08505797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 5624 bytes
font_01_sfnt_off0000836e.bin
b71f1312aebaaadeb871206839341b7b184a63a8082238ea99196d2ccca6a736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836E 9776 bytes

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