Malicious PDF — malware analysis report

Static analysis result for SHA-256 1726c7b6cb9f714d…

MALICIOUS

PDF

51.8 KB Created: 2020-08-31 07:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b3dbe403cd26f8d9acf5463447f6a51 SHA-1: 12b8e48cfa4abc608438f73ac7d79ab40a2ec111 SHA-256: 1726c7b6cb9f714d4a6946e915395a6ba587924b76fc5502470f57b401a907fa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://ttraff.ru/wix?keyword=strength+of+materials+class+notes+pdf`. The document body, though heavily obfuscated, contains this URL and appears to be a lure for academic materials. The presence of numerous external PDF links, many of which are benign, suggests a link farm tactic to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=strength+of+materials+class+notes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_60aaf34d57d44d2e8efb5eab3e0cbb27.pdf
    • https://static.usrfiles.com/ugd/b8c837_38511c11674340fa94f471187ca1020b.pdf
    • https://static.usrfiles.com/ugd/3e9e83_ac88e10dfced461cb70c5daa34e877d1.pdf
    • https://static.usrfiles.com/ugd/ea78e0_95cc6fe14b9244958bd62445db2d6b78.pdf
    • https://static.usrfiles.com/ugd/7dd30d_4a5b8ed7e37f41d4adf475549b965c89.pdf
    • https://static.usrfiles.com/ugd/b8c837_9698d9746ec44ffb9c18193521fbafa5.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/54182016151.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/wadovanit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/medscape_radiologist_compensation_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/47646530851.pdf
    • https://cdn.shopify.com/s/files/1/0432/8626/6016/files/pre_algebra_word_problems_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/jobiwirimozemovu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/mac_finder_show_hidden_files.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/tofibeta.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/lincoln_town_car_repair_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007636.bin
1a537c4fe0dec977dd5fda703069f4c78523ecd528180757c26f28de91c20151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7636 5672 bytes
font_01_sfnt_off0000893b.bin
89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893B 2116 bytes
font_02_sfnt_off00009307.bin
56512d876b0354767f6234f326ef2633a2b428af9101dc9ff6ad6b7f35fcf48f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9307 15284 bytes

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