Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af2ab0a8187c648…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 00:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f620679ac4d0df2ef93f70356165a2d2 SHA-1: e9a92da267d79e0c10ceeb69d2b65a7e73bd103d SHA-256: 1af2ab0a8187c6489246e17eb13f40979b1d5bf77473991ed364980f4bf70f77
152 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains a large number of embedded links to other PDF documents. One of these links, 'https://ttraff.cc/wix?keyword=darth+vader+emoji', points to known malicious redirector infrastructure. The document body appears to be garbled, but the presence of the redirector link and the link farm strongly suggest a malicious intent, likely to lead users to further malicious content or phishing sites.

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.cc/wix?keyword=darth+vader+emoji
    • https://static.usrfiles.com/ugd/b8c837_b9cb98e7aaa244ebb303e8d3e69481bb.pdf
    • https://static.usrfiles.com/ugd/cc14e4_83dffad58a0f4d2992908c20ed3fe319.pdf
    • https://static.usrfiles.com/ugd/97634b_3282d0ee3bc642fea4fc1663853f3221.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/bunutudor.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3640/files/gumixudaberura.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/tijatefugezewi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3480/files/access_android_messages_on_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/6994/7555/files/66427265363.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/643184136.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/71696253643.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_1cf8c82a8cad48138e01da1a07a0d7b2.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_3b5db2d2ccd84eeb98ad9e2c8c78d152.pdf
    • https://static.usrfiles.com/ugd/dcfb95_da3f33ba6a404e99bd0999606cdf9113.pdf
    • https://static.usrfiles.com/ugd/b8c837_4abf592978054b1da6bc63980d4e3767.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ac.bin
7f8796ddd47d62f781c8b0e9b783137c39959a66adaa7a3ad69352c3d5619044
pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 4988 bytes
font_01_sfnt_off00007295.bin
492a615422e42020311d5e5a69ea7d76d53572502fecc8682a907c0016235ab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7295 10508 bytes