Malicious PDF — malware analysis report

Static analysis result for SHA-256 8984c3cb8f567c17…

MALICIOUS

PDF

45.3 KB Created: 2020-08-15 23:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2dd8dea5311532e43a767aaea351da4 SHA-1: 32b6efab28f1ace2041857e6da846f6e0d7e2686 SHA-256: 8984c3cb8f567c17daaca4a927a939dac3a81c9986bd114c95ae6eec639d4649
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=mufti%20menk%20book%20pdf%20free%20download'. This URL is likely part of a link farm designed to improve search engine rankings for malicious content. The document body also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a SEO poisoning or link farm attack. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=mufti%20menk%20book%20pdf%20free%20download
    • http://kaxezi.kofc420.org/uploads/1/3/1/1/131164250/2f6de67c8f5.pdf
    • http://files.coonleysclasses.com/uploads/1/3/1/4/131483361/vidagopoda.pdf
    • http://files.thefloriculture.com/uploads/1/3/0/7/130738830/5218584.pdf
    • http://files.francelaude.com/uploads/1/3/0/7/130738701/31e806a.pdf
    • http://dogixuz.statisticsfromatoz.com/uploads/1/3/0/9/130969439/1055143.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/psychology_eighth_edition_david_g._myers.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/45969264389.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/zitabijisaderodud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/free_online_to_word_converter_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/numatigomirupevimizod.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/30193693890.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/xedoxejetirewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/75026322250.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/how_to_force_a_git_pull.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/53655820956.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065af.bin
a68a053c229829e08583520d2ea6b7833d0e7e32046f7d4460f5ebf4fb0c3eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AF 5192 bytes
font_01_sfnt_off0000774d.bin
d46260913194dd0e14eed475befa7cf450dfeb111171dab390776335347af180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774D 10156 bytes
font_02_sfnt_off00009a00.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A00 4324 bytes

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