Malicious PDF — malware analysis report

Static analysis result for SHA-256 6972de59aa3bf322…

MALICIOUS

PDF

43.4 KB Created: 2020-08-19 23:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec242c5fc14f35fc2215745d5f533a9 SHA-1: 8f992a7bf03befac87c42aff216b700887a92af5 SHA-256: 6972de59aa3bf322a1fd5fb852593009ac2187f53b1e625a3360e69033e5a427
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content under the guise of educational material. The presence of numerous Shopify links, while mostly benign, contributes to a link farm strategy, potentially to improve SEO for 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.com/pify?keyword=exercicios+balanceamento+oxirredu%25C3%25A7%25C3%25A3o+pdf
    • http://files.akilamstudio.com/uploads/1/3/0/7/130739343/xekiwiti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0431/4339/7525/files/walika.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/cardiopatia_congenita_neonatal.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3363/files/punctuation_exercises_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/vietnam_visa_on_arrival_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/cisco_ccna_200_125_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/waltz_no_2_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/ambulance_man_badge_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/dokiledalezavasevuxuli.pdf
    • https://cdn.shopify.com/s/files/1/0448/3887/9392/files/calidad_total_y_productividad_pulido.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3709/files/pafenavavojopabijuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/1587/2423/files/pamajiledapiboruborad.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_off00005bea.bin
d9eb4a6120ea016b30114cb131a3221ed83c26ec4383e7d40e50d43a01dc9751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEA 2864 bytes
font_01_sfnt_off0000661c.bin
f53d5a0f64a41aef48a519385c3606bc8cdcf2f910ecdb89d93b7a668666a6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661C 5964 bytes
font_02_sfnt_off00007975.bin
43e909c6b1c51ccd3bf18ddf3a73785b4bfd28151ff1b99f7e8aeba29817c7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 12124 bytes

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