Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b5fb8901f85a60…

MALICIOUS

PDF

36.0 KB Created: 2020-08-22 09:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c61433a2105004e6fa3d01fc7ac66938 SHA-1: 22cbb222646434f641aaaa83198682a3c698b04e SHA-256: 90b5fb8901f85a60ee92131e4a950c277cee4a85a7868625dad43c3fe06f9766
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.com/pify?keyword=croup+guidelines+nottingham'. This link is presented within the document body, suggesting a social engineering lure. The presence of numerous other external PDF links, many hosted on Shopify, indicates a link farm strategy. While no scripts were extracted, the primary malicious activity appears to be redirecting users to potentially harmful 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.com/pify?keyword=croup+guidelines+nottingham
    • http://sumerefuj.privateselectours.com/uploads/1/3/1/4/131482995/dudad_lunopinonugunig_zarupevin_taxinivupixed.pdf
    • http://ritusigid.runninonfaithtc.org/uploads/1/3/0/7/130775358/7634734.pdf
    • http://files.bhavnamehta.com/uploads/1/3/1/8/131871849/jemasugufisegabexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/70404152089.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/fakegororepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/avengers_infinity_war_trailer_2_audio.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/latest_bollywood_movies_in_hd_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/zesebupeme.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0910/files/403231885.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budexojimomamuzarumedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1872/3229/files/add_and_subtract_fractions_worksheet_4th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/fapagosisijisetebis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/blank_white_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/harcourt_6th_grade_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/nobirugozikipu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/jarikewoxosopubavu.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/air_supply_album_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f3c.bin
da2551cf95b9253bfc8baa505201ddc04a6959ec9cde7f97ca4a274ad05b50ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3C 5280 bytes
font_01_sfnt_off000060fc.bin
3be7104895a9998c26b6d1d40ceb0673207ca5afd0828b49ce3b2d6011a18ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FC 10056 bytes

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