Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac52c63688cb4c5…

MALICIOUS

PDF

50.3 KB Created: 2020-08-30 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae4623d098fb4be4253c4f8d6c58a35 SHA-1: 255e679f781a7bd4d6e61ba9232ea226b373a037 SHA-256: fac52c63688cb4c5e6f0291bca892455e2d20119989557599b065f8d8dc5446a
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=oracle+12c+sql+tutorial, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and references a 'tutorial', suggesting a lure to a malicious site. The presence of numerous other PDF links, many pointing to Shopify, indicates a link farm strategy, likely for SEO poisoning or to obscure the malicious destination. 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.com/wix?keyword=oracle+12c+sql+tutorial
    • https://cdn.shopify.com/s/files/1/0433/5996/1247/files/business_management_and_administration_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8975/6311/files/90481382168.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/22214783162.pdf
    • https://cdn.shopify.com/s/files/1/0435/7046/2883/files/nineponuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/64862310654.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8325/files/soundcloud_apk_2017.pdf
    • https://static.usrfiles.com/ugd/b8c837_6065188ab8e34fb9ba84f9bcf177a299.pdf
    • https://static.usrfiles.com/ugd/ae15ca_34ba79bffad54d61b5b7e5e65f76bafb.pdf
    • https://static.usrfiles.com/ugd/8b49c6_a6ce2b2943c04009836eee28ebfeb64a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cdb85e260694944968d6c7e18b42741.pdf
    • https://static.usrfiles.com/ugd/98857b_39cc1fcbfee7451bb0c913f9031e305b.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b2e0677ffdc434289e2fae52a9c2527.pdf
    • https://static.usrfiles.com/ugd/c63dba_63b5d0b3a8d9427c93dad4e8ee4abbbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1fb51ce81404a3294fb1828f2d667ca.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_off00007931.bin
5ee68bc2896626086132d48be0ff593f40f4416fd3ad559f0c8ee575451c1cc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 4908 bytes
font_01_sfnt_off000089fb.bin
9b88fa01669e2b04123d1f00c77feaa0da9c7d291ee7b8aff66433ab46eae1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FB 10600 bytes
font_02_sfnt_off0000adfe.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 4324 bytes

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