Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dea05feb644edfe…

MALICIOUS

PDF

71.5 KB Created: 2020-08-29 02:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ebad9839dd2133086a6b2b84670cab2 SHA-1: 758bb2cc4a50423c68a30c6d2d324811512d4e42 SHA-256: 4dea05feb644edfe1c9da7c62a6390d94ef6031ac2a8fafe7a98ab9205aa1325
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=comercio+eletronico+defini%25C3%25A7%25C3%25A3o, which is also listed as a malicious redirector. The presence of numerous other links, many pointing to Shopify domains, suggests a potential link farm or SEO poisoning tactic to distribute malicious content.

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/wix?keyword=comercio+eletronico+defini%25C3%25A7%25C3%25A3o
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2c05fe871cd4a9784b5200d3a77d298.pdf
    • https://static.usrfiles.com/ugd/b8c837_71579a2e973a4942a47c4e245a47f217.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/50622651087.pdf
    • https://cdn.shopify.com/s/files/1/0428/2456/4902/files/basic_of_c_language_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8551/3379/files/gezox.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0374/files/bedutupuwamod.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2e86cd413ae45dab10e03ad0104040a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f85d765a816a4ec080ce057d9bc9f162.pdf
    • https://static.usrfiles.com/ugd/b8c837_f138cd7fbb4b470eb7a06957bac291b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b549305a9099462bad9dae07b5a0bec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_477f3ffc5768402d8ab933cb0032aa9c.pdf
    • https://cdn.shopify.com/s/files/1/0433/9725/1235/files/mafufomobavob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/10479631780.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/topide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9857/9879/files/71735398069.pdf
    • https://cdn.shopify.com/s/files/1/0464/6843/2040/files/33924511476.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_off0000cc3a.bin
be42f81e48b9f7487a4c51762eb1fa8946acb52e80d059bee7735aaa144d049c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 5184 bytes
font_01_sfnt_off0000dd63.bin
9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 2092 bytes
font_02_sfnt_off0000e704.bin
0bb410c966454221083d97a3e67c179a69fe915817f097437499d72a8ac7f7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 13092 bytes

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