Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bfd7563bfc1b15…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 13:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d137cc929a67159362097e1d1a1e512c SHA-1: 3706e6ac861dbfc982f611bc347125b7753a7071 SHA-256: 13bfd7563bfc1b155be58b3155aa38f9a2498676e00a47d88818d8b04a7f7456
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=user+acceptance+testing+test+cases+template, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'user acceptance testing test cases template'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving password-protected archives, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.cc/wix?keyword=user+acceptance+testing+test+cases+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_665cf2c14ae843bfb5d9ccd3087f63af.pdf
    • https://static.usrfiles.com/ugd/a76634_43c91d9b74af4784b48d607990fc97be.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2221ff361a9486cbb9e7216a1bcb6bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_29b230b14f80446b9a0c7516f3789abc.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ff889fd8e914014b4278d35cef3eefc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c6562fb9f3f4a639c5972b0271a1b79.pdf
    • https://static.usrfiles.com/ugd/b8c837_e19b1b304b08440b8938ddfcc4b87809.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4a27c4c9d984441a30476cd9197718c.pdf
    • https://static.usrfiles.com/ugd/a2e20a_0e9751210390466689040948e67affe5.pdf
    • https://static.usrfiles.com/ugd/b8c837_976822f605494c2280f25cbafcfbd61d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b08baf284bd45c2bbd8604b98a96420.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/6678420730.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/bolt_tightening_torque_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/vijojanufinarisegakeze.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/79367546809.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007484.bin
f41a5716dae69272c2c69acbc7f6bd23be02567eca7b38f90a910daf0808c9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7484 5244 bytes
font_01_sfnt_off00008640.bin
3539960a9a35a9d73c36dce6d7ddb71a68faf6b248de09b5e266301145b24f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8640 10060 bytes

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