Malicious PDF — malware analysis report

Static analysis result for SHA-256 622011560c7060d4…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f74fe1fc6784c9e8b23c682a2e3fccc SHA-1: b2690681be72423c0ba820e943e45ecc97353695 SHA-256: 622011560c7060d478fb5ee4b2d862a2c0f781aa8de6bf54505e6cec3bc47d17
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, disguised as a free study guide for a Portuguese exam. The primary malicious URL, https://ttraff.cc/wix?keyword=apostila+de+portugues+para+concurso+pdf+2018+gratis, is likely used to distribute further stages of malware or phishing content. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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/wix?keyword=apostila+de+portugues+para+concurso+pdf+2018+gratis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/11955996654.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/16024429242.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/batman_pumpkin_carving_templates.pdf
    • https://static.usrfiles.com/ugd/b8c837_0da6a0fe77cb4ab7b346f046acb513bc.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/enhancement_shaman_7._2._5.pdf
    • https://cdn.shopify.com/s/files/1/0452/3973/0336/files/livro_a_cabala_da_comida.pdf
    • https://cdn.shopify.com/s/files/1/0461/6683/5352/files/30041161455.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/63398308187.pdf
    • https://cdn.shopify.com/s/files/1/0438/7989/1099/files/14967246655.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_off000069ed.bin
9de5914b091e5c146602333a98ab8cb227ed58f54b4f1a1469071daba8d38d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69ED 5832 bytes
font_01_sfnt_off00007dd4.bin
ce4e5747d00b15b263727a044371751bdc67570689536afead63ffcfba3d6dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD4 12088 bytes

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