Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78f9ec044ca126a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 02:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b22630f08026029f8d396b4c596d1465 SHA-1: c105ada8696e852252e6d2cc76d378d0b768d3a3 SHA-256: d78f9ec044ca126a4a33acd7dafe4d70889305c6e1be78c20af1a49e0b4d3514
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a common tactic for SEO spam or driving traffic to malicious sites. One of the extracted URLs, https://ttraff.cc/pify?keyword=reproduccion+animal+biologia+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=reproduccion+animal+biologia+pdf
    • http://files.reading2reading.com/uploads/1/3/1/4/131411281/4694864.pdf
    • http://files.acrosstheinfinitevoid.com/uploads/1/3/1/3/131380177/2f8aabb.pdf
    • http://vepibubi.makeandflourish.co.uk/uploads/1/3/1/6/131606490/9a234534aa080b5.pdf
    • http://files.ksp-boutique.com/uploads/1/3/1/4/131453288/3415944.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/free_abstract_reasoning_test_with_answers_and_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8775/files/xesojulilafubegimozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/binomial_coefficient_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/finger_phonics_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/57282385999.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/limaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/los_4_acuerdos.pdf
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/multivariate_student_t_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0456/9822/0188/files/rewibikina.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e75.bin
e3ed5cda00f80adcd3bfd8ef1b4ab05c2b6e359d0c2f68b0f2b76b966a23edb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E75 5444 bytes
font_01_sfnt_off000080e2.bin
a01c8820276e8ada2bd62eb0067d8ab7f12b0f6ba2754111725ccf91fb0e1970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E2 9688 bytes

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