Malicious PDF — malware analysis report

Static analysis result for SHA-256 1839e4fe3781a681…

MALICIOUS

PDF

47.7 KB Created: 2020-08-30 18:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bcf38261ee7860d379443dab9e2322f SHA-1: 6f1d77f58da1765fd0cfe9917f446c1755bcb0c5 SHA-256: 1839e4fe3781a6819ee7fee266c4744be24d94e87d6aa7157644fefc7fbde036
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.club'. Additionally, it exhibits a PDF link farm heuristic, with numerous links, many pointing to Shopify domains, but one critical link to the redirector. The ML classifier also strongly flagged this PDF as malicious. The embedded URL and the document body text, though partially garbled, contain the malicious URL, suggesting an attempt to direct the user to a harmful site.

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.club/wix?keyword=miller+syncrowave+180+sd+tig+welder
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0000/3751/files/bescherelle_les_verbes_francais.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/magofaxeroxodosiweber.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/transformers_prime_bumblebee_x_reader.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/centrifugal_compressor_maintenance_checklist.pdf
    • https://static.usrfiles.com/ugd/e1c37d_61e5ba2860134f3d901130d8fd3e3624.pdf
    • https://cdn.shopify.com/s/files/1/0429/1900/2268/files/school_annual_day_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/jagitigizuzekufomog.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/somekezuxiloled.pdf
    • https://cdn.shopify.com/s/files/1/0452/4136/8733/files/vipezumaduta.pdf
    • https://static.usrfiles.com/ugd/b8c837_a549923e13cf4248b8a2f4a604685c78.pdf
    • https://static.usrfiles.com/ugd/b8c837_6664b1be210a4483b4d4a3ef414dfdfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf6424b2a5d14e59af56f43835f6b197.pdf
    • https://static.usrfiles.com/ugd/b8c837_48aad82aea9f4dc9ae1c5ac7a2329b86.pdf
    • https://static.usrfiles.com/ugd/23e9be_26bb9e958dc544178b921e25cb400a4a.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_off000077f4.bin
19fc7a89ea3342dfcd65b80d93eedaf52090bd3bad8f1f59ec67d6779764e8cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 5752 bytes
font_01_sfnt_off00008bbb.bin
02efb3057d07fc88fcdba8c0386afaa87419496d792c255da151073890032628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBB 11196 bytes

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