Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e7b16b8c3d47cf…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 20:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aa8d56e4ef79a083e835bd562f65ea5 SHA-1: 4daecae35e454b01e6f6eaf6a47d979382eb5be2 SHA-256: 67e7b16b8c3d47cf9fa4446321a6e3ee15ac39de2adb36f1b351eb1b227ddad8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a technical document. The presence of numerous Shopify-hosted PDF links suggests an attempt to create a link farm for SEO manipulation, potentially to mask the malicious redirector.

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.cc/pify?keyword=norma+tecnica+de+anemia+minsa+2017+pdf
    • http://files.christianfitnesstv.com/uploads/1/3/1/4/131437676/4165780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5370/1525/files/sajabopumelubupin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/abbott_logo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/ad_hoc_wireless_network_siva_ram_murthy.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/5th_grade_end_of_year_math_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/95440953393.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/selonojuvewutezukaxojiso.pdf
    • https://cdn.shopify.com/s/files/1/0432/0536/1821/files/17984466805.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/komoxolufok.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/poxifekexabuxiwifutu.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_off00005a18.bin
2229f9fd40b094a11cdd6f451798ceff8510268185ad8e7d893ffe9ae9bb3c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A18 5644 bytes
font_01_sfnt_off00006d3c.bin
7650b16ac6aaeb1b67475ea600f3a4428f15ac9466f304a18b73e9ff74e9514c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3C 11220 bytes

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