Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7f450198705465…

MALICIOUS

PDF

38.2 KB Created: 2020-08-06 10:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc550a95deb613450486fc2a20a36dcd SHA-1: 6ea4dc9d123565f4362ef2a25f24f11e438a2f41 SHA-256: 3e7f450198705465aa365a40b125156bf58546a19931ae1028dd4f6889339ddd
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to obscure the true malicious destination, redirecting users to a potentially harmful URL. The document body, though heavily obfuscated, contains keywords related to textbooks and the malicious URL, suggesting a lure to download further malicious content. The ML classifier strongly indicates maliciousness.

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/pify?keyword=mathematics+grade+11+textbook+pdf+download
    • http://files.monitor-io.com/uploads/1/3/1/6/131606284/dumoxuwefe-sosew.pdf
    • http://files.care.coach/uploads/1/3/1/6/131606346/cc32095.pdf
    • http://files.shannonsarmy.com/uploads/1/3/2/6/132681556/jesofezurab_vubedaleti_jenuxinifo_wejedib.pdf
    • http://files.ekoforteang.net/uploads/1/3/1/6/131606482/236c606a9ece6c5.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/54311687561.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/nezegenugudalakofisajukug.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9132/files/primavera_p6_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/40275494680.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/electro-_city_relighting_the_wasteland_v12a.pdf
    • https://cdn.shopify.com/s/files/1/0440/4664/7446/files/historia_de_las_asambleas_de_dios_del_peru.pdf
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/d_d_college_of_swords.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/88652408097.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/vinuwimewegefedigiles.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/84385748293.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6269/files/nijorasarategimap.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_off000055cc.bin
e5905db4cca8090e3971c74f903bf5dd435063ad0337c908689cd9241df21e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CC 5992 bytes
font_01_sfnt_off00006a27.bin
707b93aa479af61ac7f2e8745fba8fee8f64a316b68189fff5647c3441236662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A27 9892 bytes

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