Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa44a9a3ccb902bc…

MALICIOUS

PDF

48.8 KB Created: 2020-08-30 10:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5187a8efc37f207a7d9e74692f0799 SHA-1: e581ea358e7813b77cb2da97a97699007cfeac91 SHA-256: aa44a9a3ccb902bc830ccaa66384f21da35b3fa790713129734042645e097de3
152 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading drivers, specifically mentioning 'M audio fast track pro drivers windo'. The primary malicious IOC is the redirector URL, which is likely used to host further malicious content or phishing pages. The PDF structure and link farm heuristics indicate a deliberate attempt to manipulate search engine results or distribute malicious links.

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.com/wix?keyword=m+audio+fast+track+pro+drivers+windo
    • https://static.usrfiles.com/ugd/5de1df_0d68ff27871448ffbb0e2ff05bb12ba6.pdf
    • https://static.usrfiles.com/ugd/81d6a4_7d15548c58a5455eb6c6b312100f7426.pdf
    • https://static.usrfiles.com/ugd/5be868_e72b07a3435d4fe291f85e3796a36ed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9a69bcc4ee8492594ddbdeac6519153.pdf
    • https://static.usrfiles.com/ugd/b5aed9_e5dfb489f3944aaf97fc1691b3532cc9.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/bolesorudirolokuwexaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/91152667521.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/76738246637.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/96664529987.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8772/files/faziwizukawozumowapus.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/fesemubamekojonutojitibaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0008/files/7726167660.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/ronirupopitubogudemubaz.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_24babb49032d429b80b473a84d61a2f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3654629aa2064e9a974cda5dc80845c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_14a25d68ba944863b75be45b38f4838e.pdf
    • https://static.usrfiles.com/ugd/b8c837_30c2c394a7de43c1b808a586a801eb80.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/
    • https://static.usrfiles.com/ugd/b8c837_b9a69bcc4ee

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070f6.bin
3e4ecb46c1d8b0f3fae5c3e9530cf4f85625e5797a02782f7f602df67c9ed257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 5340 bytes
font_01_sfnt_off0000834b.bin
122ba5b8f073f523b88befd0e442ba6335de9b1ecbafc100021362858ad204bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834B 15712 bytes

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