Malicious PDF — malware analysis report

Static analysis result for SHA-256 4125c41c3ba84409…

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 05:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f9b0aa5bd15cf7027b02cfc3e9514f SHA-1: 97722915f7f4979f4c91c877b10fca6158b90603 SHA-256: 4125c41c3ba84409f39fd2bc8938e25a79bae34efeb287ba893ff9164d219590
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be directing users to a malicious URL disguised within a seemingly innocuous document.

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=bilingual+books+english+russian+pdf
    • https://static.usrfiles.com/ugd/cd79e3_64f31f7d1c32485eaec39baf903f37de.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e2ceeff3cc145b5b535b7725b6ce195.pdf
    • https://static.usrfiles.com/ugd/b80405_a6999d2af6ba4e9a9b9b8686cbca3a58.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/66726016206.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/nubusitapuji.pdf
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/taxas.pdf
    • https://static.usrfiles.com/ugd/f6a907_5331b0f6ec17463ab85f960580702697.pdf
    • https://static.usrfiles.com/ugd/1df9ea_8f315daa08cc46de9490866df92afbfa.pdf
    • https://static.usrfiles.com/ugd/f523c3_37b0629e63cb4fb38308052950251d18.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7660/files/69625659391.pdf
    • https://cdn.shopify.com/s/files/1/0432/7748/4196/files/13592862764.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/nagunuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/66909079229.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_off00005838.bin
75482b2f03cc419c381247a953835b72c66d0fe02516a911414ce1932f720519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5838 5556 bytes
font_01_sfnt_off00006b17.bin
7525fca17801552ac6fa644a18c0a6df391d0771a0bcda8b35dd4fa373a8f54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B17 10088 bytes

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