Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1de3bc4b48f18e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 05:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca9da865f052e58fc9f3cce742aff44a SHA-1: a61352d57be6325c1e4572d38b4af36e4cdae13f SHA-256: 0a1de3bc4b48f18e6e04023f3b92c75f167e31ae2eeb8de7a128f6f21d479198
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Aptana php editor free' and includes the malicious URL, suggesting a lure for users to download potentially malicious software. The ML classifier also strongly indicated maliciousness.

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=aptana+php+editor+free
    • http://files.rapidrealestatevideo.com/uploads/1/3/0/7/130739280/nameki_pomepopujanu_suguxipir_selulimer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6660/5209/files/nalemiminupivadezikuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/nufitibita.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/beritepasavugatomexudiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5403/1270/files/54908682041.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/jutizulawojajigesipatewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/python_programming_language_full.pdf
    • https://cdn.shopify.com/s/files/1/0432/6231/2611/files/tujerakenigesokazegul.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/fapuwog.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_off00006386.bin
e6fb9511309ff505a6365bb07bb25d3db3b5dbe30d4fa6dc6d2c92618ddc3865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 4908 bytes
font_01_sfnt_off0000742c.bin
b07490876a3c1ab35a1ad459323049b9d2fb2bcfe131ff21009d2f63a73f1c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 10012 bytes

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