Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98db4720f65fab4…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 17:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3fa7dd9ca5db2cb2757c052d34a030 SHA-1: 688a1120a03088bb918a2a033ec139ecf03c4917 SHA-256: b98db4720f65fab4339b1f6908d2fc2345145a6742e0305eebfe6b2d93ef4d33
92 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to government accounting rules, likely a lure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=government+accounting+rules+1990+in+hindi+pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/44436273056.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/94188825396.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/gukerorakofuzaziwod.pdf
    • https://static.usrfiles.com/ugd/b8c837_07d0c78823af452eb49be98f48523b22.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/capillary_refill_time_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/kivezuzajazubakomivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5813/files/drama_korea_cantabile_tomorrow_sub_indonesia.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca6c945ce8ca462986d5ccd3d3f84bf6.pdf
    • https://static.usrfiles.com/ugd/5b604d_d5d29b8d6d52427492268b1cfc517e37.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_off000054a9.bin
ef679523f497dbcd9ad1d72873a644e24e211e515d03087e1930e4278ae4d5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A9 6008 bytes
font_01_sfnt_off000068fe.bin
cfe02e3622ce42028a162a08cbf059358bd47bdb4bfdfd41327c60a87eef052f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 9660 bytes
font_02_sfnt_off00008a4b.bin
54acaea9c779d7b0014070e9274e1a3a5ac89e769657b90939d266705443fa42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 2944 bytes

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