Malicious PDF — malware analysis report

Static analysis result for SHA-256 450c1e21ef6c4d60…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 04:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3435b7d413f11dc5665fcfed30abca68 SHA-1: 812a138c028cf3f3c3db2780d07d0319d411d9c9 SHA-256: 450c1e21ef6c4d602980b746210236db5f8dd5fd8e8606f4d60b5e5ad9a3b8a8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a deceptive title and numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence. The primary malicious IOC is the redirector URL.

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.me/wix?keyword=the+office+that%2527+s+what+she+said
    • https://cdn.shopify.com/s/files/1/0429/1674/1283/files/78119338816.pdf
    • https://cdn.shopify.com/s/files/1/0460/2901/3151/files/pazipoguguxokanoporisuki.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/5765402384.pdf
    • https://static.usrfiles.com/ugd/a1fb72_5873c2f224514255ad2629f379837da0.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2154/files/26901684036.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/43491688345.pdf
    • https://static.usrfiles.com/ugd/4b874d_5ec00b8d9ccc47b798c483d42b3abe60.pdf
    • https://static.usrfiles.com/ugd/cafc24_ec0e6832644c4c53a6b0f43ad67a3d83.pdf
    • https://static.usrfiles.com/ugd/fd3290_0b16cf1da0734f8987a706a661125c2b.pdf
    • https://static.usrfiles.com/ugd/77eba6_4defdf8cd1e648f88ad0af3e349f5ed1.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_off000061c3.bin
5d105418d7f62a4eacbc3cdc24228099ec5a475589ee756ad64d9937df8efada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 5056 bytes
font_01_sfnt_off00007308.bin
3b946b5e7e6996921d0c54643631c5b3356cc440aad7f38efd191d566bcad677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7308 10564 bytes

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