Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c5fa1cb034c8d3…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 13:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b154563ec10ac84030737ab7281ea0 SHA-1: 0155baa9b0582f944ed282de1c2065b8c90b5975 SHA-256: 15c5fa1cb034c8d33f7bfd8beee0f66317365ba0e0adeefa8ebca3e75fd2e24c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL that appears to be a lure for a free PDF merging tool. The document body, though heavily obfuscated, contains a reference to the same URL. The presence of numerous links to external PDFs suggests a link farm or SEO manipulation tactic, potentially to mask malicious activity. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/wix?keyword=programa+para+unir+pdf+gratuito
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ca6fec6fff4a4f048527095210d21361.pdf
    • https://static.usrfiles.com/ugd/b8c837_9babca9598b14045ad3889e6a2fec3ae.pdf
    • https://static.usrfiles.com/ugd/455f95_d930eb37d7454808990df6664039208a.pdf
    • https://static.usrfiles.com/ugd/0047a4_85b35ae131d84009a318aacc191624f3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7291/3557/files/english_test_basic.pdf
    • https://cdn.shopify.com/s/files/1/0455/6242/9605/files/jasusijelunodapojawimuzud.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/greek_mythology_summary.pdf
    • https://cdn.shopify.com/s/files/1/0428/3029/9292/files/kudejegateketu.pdf
    • https://static.usrfiles.com/ugd/1f2646_ab761701b6564bb599c4eeee8fb4c37f.pdf
    • https://static.usrfiles.com/ugd/fbccce_811b9b18d3384dc7b297ffddd24ca075.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/hey_baby_movie.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/39247438377.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/pakimetidagowed.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006209.bin
d00f9736075617c537d994e901adc002e8e73053d9c69278bd55a94f562d37c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 5152 bytes
font_01_sfnt_off00007376.bin
5263aae409b48fcf10a71334788f2b00d41b0cc3ee112f870595dc327f54a178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 11756 bytes

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