Malicious PDF — malware analysis report

Static analysis result for SHA-256 510ec271de394127…

MALICIOUS

PDF

42.4 KB Created: 2020-08-24 06:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b6292bcb516ce0178c4d01d6d5bbf7 SHA-1: 7ccd461e8a887d1010b7ad82ce7d2453e1782cbc SHA-256: 510ec271de39412759aa93fd71083b890232097677dda5505af932d3f0a86838
150 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=bacteria+cell+wall+structure+pdf', indicating a lure to academic content to mask malicious redirection. The presence of numerous links to external PDFs, many hosted on seemingly unrelated domains, suggests a link farm or SEO poisoning tactic to distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bacteria+cell+wall+structure+pdf
    • http://files.vagabond.sk/uploads/1/3/0/7/130776081/7386250.pdf
    • http://pusexu.talleylakehouse.com/uploads/1/3/0/7/130776485/defovi.pdf
    • http://pepid.eastbournetherapy.co.uk/uploads/1/3/2/6/132681488/luvegezowibuz.pdf
    • http://files.cakesbylexi.com/uploads/1/3/1/4/131453136/325759.pdf
    • http://resabek.fatpunkproductions.com/uploads/1/3/2/6/132695213/9044978.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/xuzazobiwulikuvuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/96561299975.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/expression_du_besoin_et_cahier_des_charges_fonctionnel.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/9518927934.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/93151189911.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/babycakes_cake_pop_recipe_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9158/3391/files/61825575651.pdf
    • https://cdn.shopify.com/s/files/1/0429/2155/8183/files/bash_do_while.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/lasegibazavusuwefi.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/94927423032.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_off00006675.bin
08171c88c9d282ba6b390ccd65a024012770131394043d7fa3fc67596f79e62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6675 5288 bytes
font_01_sfnt_off00007892.bin
2a2cc8a653e0fa35c9c32c804bd9d5d2f0a3ae0e1e612c0877f644ef37cb615e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 10184 bytes

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