Malicious PDF — malware analysis report

Static analysis result for SHA-256 1659fc1ecde6d266…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 02:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dedc74ae384aef0a6aa59f3bb79bfed9 SHA-1: 23c32d0a7a5c222648f266ee1e32bb4706a90cfa SHA-256: 1659fc1ecde6d266fc455e269757729ccafc8b3ae940edb2412d2986593c78ff
154 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirector URL and a list of other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to a malicious site via the embedded link.

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.link/wix?keyword=bentley+pants+press
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3e87bf_aedf9f2e2c5444508fb91bd3e231f721.pdf
    • https://static.usrfiles.com/ugd/b8c837_903ed052b9164704967317d2aaf1eb30.pdf
    • https://static.usrfiles.com/ugd/b65acf_3a83520d305d47aeb80d010ffe0ac150.pdf
    • https://static.usrfiles.com/ugd/b8c837_478ef8dea919480d9464e6ab8d2cf77f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed78aad2bad426683c752065a27b131.pdf
    • https://static.usrfiles.com/ugd/173616_92e29b5fab884b5e88888b0a3b951f21.pdf
    • https://static.usrfiles.com/ugd/d2751c_f96355ec29114ecf8bafc4c879aee0d1.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/kewazituzipuvixit.pdf
    • https://cdn.shopify.com/s/files/1/0439/3956/1630/files/93997620074.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/avon_brochure_september_2020_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0433/7470/6853/files/air_force_utility_uniform_history.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/mathematical_statistics_with_applications_solutions_wackerly.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2555/files/13727911225.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/58128707160.pdf
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/button_mushroom_compost_formula.pdf
    • https://cdn.shopify.com/s/files/1/0432/3354/2303/files/adverb_placement_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/tudukumiv.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_off000067b2.bin
c3cb0c68f5497bac193c37056b78899b964039543064fb418dd379c534e24239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B2 4964 bytes
font_01_sfnt_off000078a7.bin
407408a13d37c2f3b811dc167f80a34371b9e3624a16f81199853ba56824ffa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 10924 bytes

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