Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aad3e35f7dd99fd…

MALICIOUS

PDF

47.8 KB Created: 2020-08-31 09:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f050ceea48a3a9f50ce5b3b4dd5b496 SHA-1: 88a2f83fe5573d9cc9ee030e70808dd7b0e84913 SHA-256: 3aad3e35f7dd99fd37554d32da9a0b884f04ae79c10339c909bf64b4abbdc32a
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to this malicious site. No scripts were extracted from this sample.

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=papel+deco+para+imprimir+pdf
    • https://cdn.shopify.com/s/files/1/0432/1070/3010/files/5930776681.pdf
    • https://cdn.shopify.com/s/files/1/0431/1796/9570/files/boxemutejedonimijujobirok.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/bizar.pdf
    • https://static.usrfiles.com/ugd/6cf392_ab05ce2b5fe246a89fe284bd460ef838.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4abdd563b084907801b7395f72b7dc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc15fbd2af7f40538e429bed6b43baaa.pdf
    • https://static.usrfiles.com/ugd/4cf28d_44a8396a4c2744f1821798ae7388524c.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a1a1ea9071436fa46061a6bd567d35.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6b7d4e6566648ff8d62b88f85dfd127.pdf
    • https://static.usrfiles.com/ugd/3fc21f_6cb2ba7df30b4c6a82c0aae15f3f5996.pdf
    • https://static.usrfiles.com/ugd/63d3ad_c7decbd0926f4a33aa187627a5061200.pdf
    • https://static.usrfiles.com/ugd/f80014_841fdbde45134b83a4d5a0252a9e91cf.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_off00006447.bin
7a3d207c3dbf68c27f4984555319014ccf5b7dc45dea6eb48661df57e829c8a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 5124 bytes
font_01_sfnt_off00007599.bin
0cc0a026f733500a2f5cd80bf9b0c4873c0d25848cba6193c6ba3095b56fc9a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7599 11976 bytes
font_02_sfnt_off00009bd1.bin
653593fd1d80a85ed6f0165f1aba34eea3860f78c4af0c5284fe4824caf7b9a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD1 16120 bytes