Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2393db2426dcdc…

MALICIOUS

PDF

67.6 KB Created: 2020-08-03 16:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b8c4ea24af8f3294ed0f5b283c38e1 SHA-1: 5dba24ae29cd6028f1fe21d8abf9d6eecdb957a7 SHA-256: 8a2393db2426dcdc231e9fc0b7162c8dd4e0223bf2a386321d24507ae11c6e82
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Corporate risk management book pdf' and the malicious URL, suggesting a phishing lure. The PDF also hosts a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, likely to obscure 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.com/pify?keyword=corporate+risk+management+book+pdf
    • http://files.projectcancerland.org/uploads/1/3/0/7/130776110/sejopuwam.pdf
    • http://files.amalgamatednurseryschool.com/uploads/1/3/2/8/132815054/1975663.pdf
    • http://files.tcfallnationals.com/uploads/1/3/1/1/131163712/duxedim.pdf
    • http://files.visit2day.nl/uploads/1/3/2/8/132814680/530098.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/xexukikupekasuxekovoxogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/fipep.pdf
    • https://cdn.shopify.com/s/files/1/0433/4338/0631/files/wand_of_cure_light_wounds_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/11473573555.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/84651843112.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/67242312742.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/free_math_worksheets_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/41014814093.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/survey_of_accounting_7th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0443/2723/9836/files/eyes_text_symbol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/97904463814.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_off0000bd2d.bin
c8e3d6386d0cec93e22bed4dcdbbda266316f3e19bbc6868fea808fdfb7c8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 5344 bytes
font_01_sfnt_off0000cf39.bin
76652c6300792ab5e06d65cfdbb46db346f08d3d8c453399e95d55fa6c190b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 10452 bytes
font_02_sfnt_off0000f2dd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 4324 bytes

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