Malicious PDF — malware analysis report

Static analysis result for SHA-256 457befdc7bf16a89…

MALICIOUS

PDF

39.9 KB Created: 2020-08-14 22:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e224815b81d3a4c9106f2cebf2917356 SHA-1: 67bd0af5b9b814fdccb6d3682dcaa67dbfbfb926 SHA-256: 457befdc7bf16a890ca4137530378f4cc9619b7f482b126a4923e660787c8170
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=hozier+piano+sheet+music+work+song, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content under the guise of providing piano sheet music.

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/pify?keyword=hozier+piano+sheet+music+work+song
    • http://files.bigjoesales.com/uploads/1/3/1/3/131380944/kisaxufalof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/39436698488.pdf
    • https://cdn.shopify.com/s/files/1/0438/3113/2322/files/google_drive_password_protect_folder.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/11304758127.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/47329902167.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/19389441921.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/definition_of_socio_economic_development.pdf
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/netizo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/25427483057.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/jobimanaxurubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/39792047860.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_off000048d3.bin
819c6b83c88a2d9ac9d64be839d29b1cbdad846f48c2d3076ca9359a3a679e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x48D3 5480 bytes
font_01_sfnt_off00005b61.bin
22882ba2974fbeaacb685b4b55534ac38a5c2afa6734307e9cf1189544946722
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B61 9968 bytes
font_02_sfnt_off00007dd8.bin
73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD8 16120 bytes