Malicious PDF — malware analysis report

Static analysis result for SHA-256 b471b1364091f948…

MALICIOUS

PDF

38.8 KB Created: 2020-09-03 03:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e2e733da905d8f4165c301ac40d831e SHA-1: a2991b53ca72a1a0531007c9285d9b82c7c79359 SHA-256: b471b1364091f94842aa4edbc236efa1701e90f88cf49097fdea3c2d7015a5d5
152 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, disguised with a seemingly innocuous keyword. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains the same keyword and the malicious URL, suggesting a social engineering lure to trick users into clicking the link. The PDF also contains a large number of links to external PDFs, many hosted on static.usrfiles.com, which is likely part of a link farm to improve SEO for the malicious content.

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=ajari+aku+islam+2019+full+movie
    • https://static.usrfiles.com/ugd/529385_8b7ff8a3abb14fa3b6547cec9d2e3432.pdf
    • https://static.usrfiles.com/ugd/625844_a34a39973a234345a73a5c76dbcb448d.pdf
    • https://static.usrfiles.com/ugd/451a43_1061a765a69441f9bb8994ef8937df2a.pdf
    • https://static.usrfiles.com/ugd/3de8a6_b5eb98a09c254d549d84213cfa7c3d64.pdf
    • https://static.usrfiles.com/ugd/d5415a_342b76a329814976be09cb7e7e68bcd9.pdf
    • https://static.usrfiles.com/ugd/50de67_aec6b1760ff842a899f3210bb9be0c02.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_d7184e74ebdc4a0696cecc1729ff9020.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/99745554749.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/google_sign_in_android_kotlin.pdf
    • https://cdn.shopify.com/s/files/1/0469/4510/8129/files/borazuxilirimevoxujal.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/bhagavad_gita_yatharoop_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0452/3150/5565/files/familia_ixodidae.pdf
    • https://static.usrfiles.com/ugd/ecec20_9f95109042be458a9cac268ba255a965.pdf
    • https://static.usrfiles.com/ugd/1e11d0_bd34c6a4928049cb9dc397a96cf2d5e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d9c1b7c5fdc412f8793aac7ea0c75cd.pdf
    • https://static.usrfiles.com/ugd/8a419d_0602e6e61a7a48e182bce4e6212e5e8a.pdf
    • https://static.usrfiles.com/ugd/dd6616_9b07031d822f4b0087dd06b62e2f9c6f.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_off0000576c.bin
27a098f72da3b689cf02f61be61d212c274ee5b15e2222dd8c64131f2e7873f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576C 5584 bytes
font_01_sfnt_off00006a66.bin
50df26ecd70b5c5fe5bf68d3cd3b67545ed1d273417641398dd69075c0c1ac80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A66 10460 bytes

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