Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64bdfcbb38f02de…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 04:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e13270a4ab0c8dc2c6bb23d2785b31 SHA-1: ef1faf315d307e3c4d4fc025b9d8bd6e6929d85b SHA-256: f64bdfcbb38f02de309765ed9ae8ae3810fd7010bbf22545d6cd09fd6eea9f2a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=descent+into+avernus+pdf+online', which is flagged as malicious. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for phishing or to serve further malware. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a potential link farm or SEO poisoning attempt to increase visibility.

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=descent+into+avernus+pdf+online
    • https://static.usrfiles.com/ugd/90423f_5d531c0d6afd47588e7b7a99cd07c61a.pdf
    • https://static.usrfiles.com/ugd/20d83a_c68139ac3ed94e908418ffff4fb4d432.pdf
    • https://static.usrfiles.com/ugd/b8c837_b72b27a34f524b0f8a4beff5cfb824de.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/10347016073.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/five_behaviors_of_a_transformational_leader.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/curative_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/21375259386.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/standar_nasional_akreditasi_rumah_sakit_edisi_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/marketing_department_internship_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.pdf
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/carprog_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0459/6059/3567/files/bison_animal_information_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0728/5147/files/sejarah_agama_kristen_protestan_di_indonesia.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630d.bin
a6f9347872fe50c895a7af60911baba38387bde297c3e8f2467816721a7c2c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630D 5092 bytes
font_01_sfnt_off0000746c.bin
28eedb719ee23fc43102515a7f4d6b4f6acca8a0323bd2186ee80c6ec2941e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 10404 bytes
font_02_sfnt_off00009827.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 4324 bytes

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