Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ae29dd16c590f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 06:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33a8d6df402d9989afdfe1b56c250808 SHA-1: 831e68c1136009c2cd7a8eae997a4d73f61cfe98 SHA-256: 391ae29dd16c590f0f3bd40526e39a17265f6ba03d43d6421b578f1d384471c1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, https://ttraff.ru/wix?keyword=ejemplo+de+cuaderno+de+bitacora+del, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to a logbook. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to obscure the malicious redirector or to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=ejemplo+de+cuaderno+de+bitacora+del
    • https://static.usrfiles.com/ugd/b8c837_ff00c782878243f186a064583f7b7c58.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1b9eaafee024ac588beca8e65b2ae98.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa0b8f7bc4ac4d178c722b033605f052.pdf
    • https://static.usrfiles.com/ugd/b8c837_6089b2989afa43249875c1a84d36af5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9094cecce29413e8dbf969416a669a0.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/66676075729.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/41083333404.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/bejuwuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/nerapujiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/18851094540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/buwejiwodor.pdf
    • https://static.usrfiles.com/ugd/b8c837_d16976069f194bbc8d388cb05b025464.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ee598425d8f409abc7629fa27cc1dae.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e07387318ce4705b798c2e772f050b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5f0a7616f2c4122a05a0dc4150c0a8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7fb09465e844f60a5f78eeb576c7fdd.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_off00006279.bin
13a3cf70ee94cdef92e1fa109166b8481759a4b9c4092a2594498a6ecc546d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 5212 bytes
font_01_sfnt_off00007416.bin
59069f279a57a60346bec101b5a85beff53b05fb8b2cdb9480f1aa27790352cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 11180 bytes

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