Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4f04e469bc0ce3…

MALICIOUS

PDF

45.2 KB Created: 2020-09-03 16:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddbe10b5386a9fc36336e2641c3922c9 SHA-1: e925728937fc7fe661fc4aedb4783473ba816cdd SHA-256: ec4f04e469bc0ce357fbdfc97d953de69a159e05f764e05f17b45927a6fdec77
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=format+string+vulnerability+lab+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0432/7935/1968/files/pejum.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to these URLs, suggesting a lure to external malicious content.

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.club/wix?keyword=format+string+vulnerability+lab+answers
    • https://cdn.shopify.com/s/files/1/0432/7935/1968/files/pejum.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/descubre_1_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/cancer_de_pancreas_causas.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4743/files/14819267099.pdf
    • https://cdn.shopify.com/s/files/1/0434/9313/0390/files/zemibuxukomoxavexosevurif.pdf
    • https://static.usrfiles.com/ugd/9219f8_690c4173bc2b4003b0c7b1e83c8ccd67.pdf
    • https://static.usrfiles.com/ugd/b65acf_fdccfaee9a31400fb5493b31e29dc7ea.pdf
    • https://static.usrfiles.com/ugd/12745a_0be60f92792b4a578d2fea923ea515e2.pdf
    • https://static.usrfiles.com/ugd/cd79e3_732a6356db134c9c89de4eceb15c26fa.pdf
    • https://static.usrfiles.com/ugd/d5415a_b003a48875734b9e870c07b3ae232fb8.pdf
    • https://static.usrfiles.com/ugd/efc97f_260178d21cc04b849e32e70d7be2393a.pdf
    • https://static.usrfiles.com/ugd/0c4177_eb1f111e46264eec898c41fdd86b1cd7.pdf
    • https://static.usrfiles.com/ugd/7c41c1_bbaf4bf545ef45f7a122cc63d29b6a06.pdf
    • https://static.usrfiles.com/ugd/93971e_fcbf5df0da8a4909b5bc4a71bd46b468.pdf
    • https://static.usrfiles.com/ugd/0251f0_7ddfdc1d776e4bae9b147bf3bd8ee22d.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/mavic_pro_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/28841058571.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/dekobeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/lakawuzuravuzujofuvafu.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/astm_a193_gr_b8m.pdf
    • http://www.cis.syr.edu/~wedu/seed/Labs_12.04/Software/Format_String/
    • 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/
    • https://cdn.shopify.com/s/files/1/0446/5927

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f50.bin
a572deaf9a0070ba720b0432672f10f23cfa819892110c0a9fe3bd13cb3a30ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F50 5356 bytes
font_01_sfnt_off00008187.bin
24707e8c24916fa570419c01c97647e96934feb1c6ce5dca02328ed9a5396200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8187 11156 bytes

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