Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fb9cbb25c971bf…

MALICIOUS

PDF

61.8 KB Created: 2020-09-08 04:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3771fecf40fedb6e4d4dc7edfee389f7 SHA-1: 2e0c6c202387e134eff4668df90b8103c00300a8 SHA-256: c7fb9cbb25c971bf7370aeb46d288ed1c1b6dd5860bd6950863fcc88f7b507e6
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malware through a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links, including a malicious redirector, points to a phishing or malware distribution attempt.

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.ru/wix?keyword=dwarf+warrior+wow+classic+guide In 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://static.usrfiles.com/ugd/4f92c1_f6589965edab494e97deec3e932e29a0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b9728_b4b420d6cad94d358a2cd4f69594e1e3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cac9e4_346328eea4e24d6fbb7e4172828c6545.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/aff7ca_d36dadc3b414448ea9246f202c39cc55.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b9728_2cc3f92fcd1c48eaaef751bebb52a220.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f34823_0cb87ba103c14e51b8015d9dba453a2c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6f7357_225a7de6487b461e840294389cbe29ce.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/5094397183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/how_do_you_write_differently_in_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5185/9611/files/5e_player27s_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/xosanasazu.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/136d07_5b528d5f0b4a4d3986fe037d807f36d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/105a8c_32e918194b2b4d529fbbc954a4aa8791.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c836c3_d65dba1477ae492799f9fbf440429894.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cac9e4_43b149a693de4bbba6415e85f4d3a579.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eeb7bd_3cf7ea42de7d40c7a8bc03cdf3852b48.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_off0000a563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA563 4976 bytes
SHA-256: 5570cc5ca2c1b4b31329221ab3b082e13d19a59c1ca52276d8d017f4dc063433
font_01_sfnt_off0000b672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB672 11020 bytes
SHA-256: bae98e4175a1c22f563002f37907d44ed7367ffda8572efcd85507126d6b39a8
font_02_sfnt_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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