Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1290f14383b7c8f…

MALICIOUS

PDF

59.7 KB Created: 2020-08-29 11:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ed747c286c8905d4732fa0592518c9 SHA-1: 29ed5b2bf20cd2d7b43bee5d3c12d71ecb784212 SHA-256: a1290f14383b7c8fbc2915e0456ec68b70bfbbbc541444a649046b7e2bc01c87
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.ru/wix?keyword=bushmaster+xm15-+e2s+serial+number+l', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a deliberate attempt to lure users to a harmful site.

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=bushmaster+xm15-+e2s+serial+number+l
    • https://static.usrfiles.com/ugd/b8c837_c73cfb7d4e44477f809a204966db6af4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4673dce8f7542ca9b8e42640f6dcc40.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1340f1607743f594209bed08f197e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1befd1435fb456193bef9b441353e4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7202ca3fb5d4b8d985085529222a7bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43df2f9b04c402e848935d96cd244f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_244c20871d254709ae39f38d64059956.pdf
    • https://static.usrfiles.com/ugd/b8c837_46e135fdbf8d4fa8bee14fc6ceb14922.pdf
    • https://cdn.shopify.com/s/files/1/0439/5368/4638/files/mogovotigenovepajom.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/kaxewekubopajexetoweweno.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/93242059056.pdf
    • https://static.usrfiles.com/ugd/b8c837_a58ddef50f6f44dfb7e6aae06013f5b3.pdf
    • https://static.usrfiles.com/ugd/5be868_e8c083bcb74744708eeb61c3dbdaad6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c47477d0a47479489360f4e2d25dbbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_04df39916c0448b7893174574e4d757d.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_off000093f3.bin
b9319dab88ffde57059e7f697e19a07be9b59c2b3db5a5b2da16d18675de0f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F3 5524 bytes
font_01_sfnt_off0000a6a9.bin
d75943bd4d3bdee97500b41dc78b71452a3539df6fe649344e19d72a11c53be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A9 11360 bytes
font_02_sfnt_off0000ccaf.bin
8e42d56dae80485ab44b605faf929d3090604e41aaa333555e3e2405fe999d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 16064 bytes

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