Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ac13f2d735b205…

MALICIOUS

PDF

51.0 KB Created: 2020-08-13 23:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a207c84b44bb39181da95391b0fb3b59 SHA-1: 27a587dc1c04ad5f5c802a60ed3e9517f8fb5c75 SHA-256: 66ac13f2d735b20545931c002bd4998bdaad29baad038aa77ad9bfaf0cdbd96f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'penelitian pajak akuntansi pdf' and a URL that appears to be part of a link farm designed to attract traffic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=penelitian+pajak+akuntansi+pdf, which is likely used to redirect users to a malicious site.

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.ru/pify?keyword=penelitian+pajak+akuntansi+pdf
    • http://files.alexandrajelleberg.com/uploads/1/3/0/9/130969346/33d374d.pdf
    • http://files.johannamassagetherapy.com/uploads/1/3/2/6/132682929/ronuvuvojibosanideru.pdf
    • http://files.mbpflowers.com/uploads/1/3/0/7/130739835/xitanef.pdf
    • http://files.artfine.com/uploads/1/3/1/4/131453919/majoweb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/bernoulli_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/gapigegixotojajig.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/8101570191.pdf
    • http://files.mesweeney.people.ua.edu/uploads/1/3/0/8/130813448/figuzanovetok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/jasufuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8333/files/29729702320.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/37678512627.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/microsoft_azure_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2137/files/maratha_aarakshan_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0435/0889/1807/files/agencies_of_social_control.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/xezixora.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/kilojotofazas.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/60415865186.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_off00008a65.bin
0d37fda41f0711d66eba0683cebe1e18c5c21346d2dd4c177d93bf3881a68f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A65 5080 bytes
font_01_sfnt_off00009bc3.bin
a58cc117b045beaf1e3a098a397fdf474a93c3125e8e4ccd28adb5bbb3e1a541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC3 10196 bytes

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