Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1a5cbd4c348a3b…

MALICIOUS

PDF

40.4 KB Created: 2020-11-03 12:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6ac450148eded393b0a9135ec2b9d706 SHA-1: eb5516b607992907a669f4e89e0482003cad278f SHA-256: ca1a5cbd4c348a3ba22e93e83d520034c774866685692cf8f2d9822e6875754e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself appears to be obfuscated or corrupted, but the presence of numerous links suggests an attempt to drive traffic to external sites, potentially for phishing or SEO spam.

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://gettraff.ru/aws?keyword=2020+tennessee+state+wrestling+championship In PDF document text
    • https://fosizujofaz.weebly.com/uploads/1/3/4/3/134315976/8608bbaa.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/jatedano.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/abbcf01823f57f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f8ccf4086e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f9e5efc688c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/10209092031.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/7719214193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0883e6-6690-4711-8203-a520c55d7b0f/impulz_luts_free_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62a20d6-4d1a-4acd-95cf-08adf778ab7d/kugijuxanojiripageni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f570a762-b0fd-47be-aa04-7b153d34fb6d/bedobepixikezitaxutilukov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be2c65c-de06-4a29-ac40-1ce765c7a7ad/53747716733.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/xibep.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/gta_5_cheat_codes_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/72250802688.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5090 5404 bytes
SHA-256: e36d65bd95a0044ad8d606a0e7b45695954cdac819135e0515c05b5df7fd7135
font_01_sfnt_off000062c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 10324 bytes
SHA-256: 300beee0f5e074e934f26377d26006626c133712997bc4a949548138e805908a
font_02_sfnt_off0000863a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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