Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad5fe34e4c0f5b8…

MALICIOUS

PDF

46.6 KB Created: 2020-08-14 00:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0f471bc1a2f9675ca0db735a08e31dc SHA-1: 927b8ea84e2d49d7c09a1c26ad2af2e56332e305 SHA-256: 4ad5fe34e4c0f5b87d64aab3febd5b28ece33923cf78d6081be8d96d50a9dfe3
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to ttraff.ru, disguised as a search result for 'pearson textbooks online pdf'. This link is intended to lure users to a malicious site. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wb?keyword=pearson%20textbooks%20online%20pdf
    • http://files.hernanbrizuelatango.com/uploads/1/3/0/7/130776033/3000255.pdf
    • http://files.ohanahomeschool.org/uploads/1/3/2/6/132695629/3465808.pdf
    • http://files.coryblake.org/uploads/1/3/0/8/130874141/8777e5e.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/algebra_booleana_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9666/files/accounting_concepts_and_principles.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/rozurawipugiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/25085871933.pdf
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/medicine_buddha_mantra.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/sales_executive_job_description_for_resume.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/xujuxanemogopajukaxolapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/54591696127.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/74509306958.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/acoelomate_and_coelomate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006948.bin
85c4c574eef36140087716ed43bb396f0839e027666c6de84f2b078791f49885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6948 5096 bytes
font_01_sfnt_off00007a9c.bin
0b95e1332d50324b1dff15affd1e7aec315a134900e55e6832ea722fa1c12a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9C 10836 bytes
font_02_sfnt_off00009fa1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA1 4324 bytes

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