Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a41807374c5f1a4…

MALICIOUS

PDF

50.2 KB Created: 2020-09-07 21:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e852422d5990700abc4ea40d0cbf7cd4 SHA-1: e3483fb4e43ab16c3ce56fd74031c4a50125ff80 SHA-256: 8a41807374c5f1a45907c81636b1a0451af1347f59e7fbde8283796f9a07e092
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, https://ttraff.link/wix?keyword=zinc+acetate+chemical+information, which is a strong indicator of malicious intent. The document also functions as a link farm, directing users to numerous other PDFs hosted on Shopify and usrfiles.com, likely as a method to obscure the ultimate destination or to distribute further malicious content. 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.link/wix?keyword=zinc+acetate+chemical+information
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/40407939728.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/51187514305.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8342/files/friday_the_13th_1980_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/nifuwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/wovufiresore.pdf
    • https://static.usrfiles.com/ugd/3f0e57_0cd227a8376a40a2928b16ad2f3dea32.pdf
    • https://static.usrfiles.com/ugd/9e53d4_736a0ed3b4a648038c52c4a2ce816cd3.pdf
    • https://static.usrfiles.com/ugd/221f3a_c3a6e48c161a4fa8b00aa56237e16adb.pdf
    • https://static.usrfiles.com/ugd/2b98a3_5d82ae751a1d4acd8dbad29ec09912bd.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_91e019498e604de7aa9c2ada025ac77a.pdf
    • https://static.usrfiles.com/ugd/8acad3_436b307630614670ba6894388bd27383.pdf
    • https://static.usrfiles.com/ugd/9ea91e_27be3559339649feb9f490a461bc287d.pdf
    • https://static.usrfiles.com/ugd/d3758e_0a0f7a045d1e43d7ac8b6aa1245e0c49.pdf
    • https://static.usrfiles.com/ugd/97634b_4e4f377526ae455585e21c9f0d0f8605.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_cc61b2941eab4baab31ea30166a7c65f.pdf
    • https://static.usrfiles.com/ugd/e8dba5_d046e4da481b4498add09db9078a2749.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_off00007188.bin
9589e786a27e00649aa0a843a44a557b27d2e5c802326f1a35b5cf322a7978b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 4900 bytes
font_01_sfnt_off0000820b.bin
383836be6729a1766014b7f89cc9be5bf62afeec56b483da58c9bf5b67b79b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820B 10568 bytes
font_02_sfnt_off0000a673.bin
ab88ee0552c0e3f63de41ce736f8b12df66eba36e00887189a948e70e29870c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA673 16196 bytes

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