Malicious PDF — malware analysis report

Static analysis result for SHA-256 62149b01053723e4…

MALICIOUS

PDF

49.8 KB Created: 2020-08-21 14:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03bb5aba5d80f9879d1e31720342fea2 SHA-1: 079e30456e5a8749b1da7e393205f34b0cbe3408 SHA-256: 62149b01053723e4521b3b7f7316f8452a155d2053ced37571327ab8e95b250d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=jumbled+words+to+form+meaningful+sentences'. Additionally, it exhibits characteristics of a PDF link farm, embedding 17 external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to malicious content.

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/pify?keyword=jumbled+words+to+form+meaningful+sentences
    • http://nikun.robertacervelli.com/uploads/1/3/1/6/131637257/7552573.pdf
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdf
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdf
    • http://vopofaket.penultimatephotos.com/uploads/1/3/0/9/130969264/kuxijapufidugoj-jomawizakog-zejejegekizudi-setobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/71384265383.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/40080319693.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/89839312379.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/vazam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/73229975702.pdf
    • https://cdn.shopify.com/s/files/1/0428/8072/9251/files/pibunexetilewafatib.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/jodozap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8970/6664/files/keirsey_temperament_sorter_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/24414742806.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/accountancy_project_for_class_11_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0434/1936/9639/files/breakthrough_plus_1_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/98374619897.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/analysis_of_black_hole_thermodynamics_project.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_off00008428.bin
3e1b2cd357da48618f5a3980be1f215e6a7dfca5ba1c468ecf0a82a0b50540d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8428 5560 bytes
font_01_sfnt_off00009706.bin
ca2fede60a4b4e43717ad338a4de2636542b5bc2f652accdf6285f8f0014fd4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9706 10128 bytes

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