Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f280ee8e6bc6fa…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 06:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7509d42322afbf19ccf9d9247753a87 SHA-1: c2374b8ad7665466c76a569cf9ac94d4ec0a04a1 SHA-256: 15f280ee8e6bc6fa8279acd3d604b1123b5bc82298c9f05ce150096706b5a988
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure victims into clicking malicious content, potentially leading to further compromise.

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=obras+de+jorge+basadre+pdf
    • http://files.teastowels.com/uploads/1/3/0/7/130776338/63289.pdf
    • http://files.karleekilker.com/uploads/1/3/0/7/130775746/zewoka-bosovolafu-sugusa.pdf
    • http://files.wildflowerphotograph.com.au/uploads/1/3/2/6/132695339/lezewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/giduzop.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/lesezuzodilojek.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/adverbs_phrases_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/6316/4580/files/libro_a_travs_de_la_biblia.pdf
    • https://cdn.shopify.com/s/files/1/0435/1292/2264/files/namozoxexusine.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/nekepowarudejozogejor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/jiwakedibumafebijeru.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4815/files/6080398483.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/63890166566.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/807255133.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/57280443808.pdf
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/90501424584.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_off0000707e.bin
62385f885516ccbb4ccb9b928a3ba233b05fff17e2cd87ab285ba51d877500d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707E 4976 bytes
font_01_sfnt_off00008178.bin
33de7dec14fcd5d1ecdf5ce6c4cd5c2fc706f74c005682dc9a5ef55a829fa9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 10664 bytes
font_02_sfnt_off0000a46c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA46C 4324 bytes

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