Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fce52c3dfca5d42…

MALICIOUS

PDF

47.3 KB Created: 2020-08-18 13:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da3605a0d44bb226d1c37afe3fefbbe SHA-1: 664e192d9109625df1ba3986d83bf1971220fd00 SHA-256: 6fce52c3dfca5d425c66ee6b7f2c5bbb2f8c965f3c1c97b5b06077f9469a9e90
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/pify?keyword=cachaza+de+ca%25C3%25B1a+como+abono+pdf. This technique is often used to obscure the final malicious destination and evade detection. The ML classifier strongly indicated maliciousness, supporting the conclusion that this is a malicious redirector.

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/pify?keyword=cachaza+de+ca%25C3%25B1a+como+abono+pdf
    • http://files.actionherophotos.com/uploads/1/3/1/0/131070888/7b58b7b2a45f.pdf
    • http://files.luftkrieg1919.com/uploads/1/3/0/7/130739117/c4c770e10212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3062/files/aqeedah_wasitiyyah_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/xekikutop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0101/files/natural_glue.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/bengali_recipe_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/63948067604.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/54382856541.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/cds_1_2020_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/kajadoxexirona.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/49326402756.pdf
    • https://cdn.shopify.com/s/files/1/0436/9180/2777/files/jazopapodetixapininesoro.pdf
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/38464270995.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_off00006cef.bin
834ea6201ccc4c22662039a35dd3e83f1a9909510121d629c5c71eaeca6eb49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEF 5176 bytes
font_01_sfnt_off00007e14.bin
76cf14eca849ad25a1e8efe29c01cca843257ed044c43deaa19a1c0edcde3371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E14 10492 bytes
font_02_sfnt_off0000a028.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA028 4324 bytes

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