Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a4344ef3ec26b2…

MALICIOUS

PDF

46.5 KB Created: 2020-08-06 11:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a984378616103fcd035e1f07effeb27 SHA-1: 751ce7391a62f87c0f8e95591f8630d6e8a0f5e1 SHA-256: 83a4344ef3ec26b219b101c2d36d470318e1d52c1acdb9cd8b464714a3cc46d3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.cc/pify?keyword=best+self+co+weekly+action+plan+pdf, is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious verdict.

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=best+self+co+weekly+action+plan+pdf
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdf
    • http://files.glassfloatproject.com/uploads/1/3/1/4/131437513/477b90a.pdf
    • http://gilugek.wayofthemaster.ca/uploads/1/3/2/6/132681556/lipuwapoka-xesilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/72686155076.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/21647635772.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/romeo_and_juliet_plot_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/5441045166.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/bofef.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/munafumojorenivufepi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/anaerobic_digestion_of_solid_waste.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/77060028716.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/difference_between_mitosis_and_meiosis_table.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/87986622263.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/wexoburenoposareri.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/84700401698.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_off00006b22.bin
ac5c32646b94c68ceca4fa29ebe1605716b5dd312f4077eee8cc93d0804651a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B22 5360 bytes
font_01_sfnt_off00007d91.bin
446f680f9e84a84f1034a1bf04229e7901a7661c12d710c384975b3cf15145c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D91 2600 bytes
font_02_sfnt_off0000889d.bin
9aa9cd399b619b6382f17c44d7ba3141641c061fc1a2140a5af62a129283e336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 10576 bytes

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