Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b1c1460f7eb48b…

MALICIOUS

PDF

46.7 KB Created: 2020-07-18 03:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41aa5d331e9d4d0fe7128aa939eb44e3 SHA-1: 71334af16b78f8398d701b1b30f09b398e5e770c SHA-256: 82b1c1460f7eb48b19a4f8c4ca8801561e7ffdf982348e21318aaf573b4f50e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate search results for admission information. The primary redirector URL, 'https://ttraff.cc/wb?keyword=kuet%20admission%20result%202019-20%20pdf', is flagged as malicious. The ML classifier also strongly indicated maliciousness, suggesting the document is intended to lead users to harmful content or exploit vulnerabilities.

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.cc/wb?keyword=kuet%20admission%20result%202019-20%20pdf
    • http://files.simonemgenna.com/uploads/1/3/1/4/131483153/3916138.pdf
    • http://files.borrellgolf.com/uploads/1/3/0/7/130740124/6887710.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://files.brite-technology.com/uploads/1/3/1/4/131438077/95d545188f5e.pdf
    • http://files.distantfieldproductions.com/uploads/1/3/1/8/131871891/508377.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/jelimavuzodofowenisawur.pdf
    • https://cdn.shopify.com/s/files/1/0432/8787/1646/files/11569991745.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/88387549658.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/4334493361.pdf
    • https://tawumigudifo980931470.files.wordpress.com/2020/07/latewujafedob.pdf
    • https://suwaboto.files.wordpress.com/2020/06/50596873698.pdf
    • https://bafuximafeza467793456.files.wordpress.com/2020/07/77907614148.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2240/files/notepujowapowezuvusapiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/gejezexasopujujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/51975650681.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6733015585.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1461/files/90331387664.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/zosusanunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/61129828479.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/beloromawodosuxaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/judimasamepilebewiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076fa.bin
9bcbedf5ede96391ec724bc752da780a242cc70e8d8adde73353c0ec38aa2506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FA 5552 bytes
font_01_sfnt_off000089c8.bin
7dcc8a9f84e0b9596a86a8e159f15d1045e21b011eaf002ef0c3fc757aa0cda1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C8 10244 bytes

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