Malicious PDF — malware analysis report

Static analysis result for SHA-256 515c5b5d4019b7a5…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 01:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285f53a115ef602b7aeece24c11d7b54 SHA-1: 4f0d5122f357213fdb2ff14748695df41a5bc39a SHA-256: 515c5b5d4019b7a55f225d08444f210a95179fdc8d8a40a030b24c65d43cfa82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to 'ttraff.ru', identified as a malicious redirector. This, combined with the PDF_SEO_LINK_FARM heuristic, suggests the document is part of a link farm designed to direct users to malicious sites. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'Bayalu daari songs'. No scripts were extracted from this sample.

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.ru/wix?keyword=bayalu+daari+songs
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/59286537355.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0435/files/project_risk_management_articles.pdf
    • https://cdn.shopify.com/s/files/1/0432/1456/9631/files/lubexeb.pdf
    • https://static.usrfiles.com/ugd/ddb60a_3e10e75a1245418c81122e4b7beeb2f1.pdf
    • https://static.usrfiles.com/ugd/0c268c_cee7eafe51f84323968b5dfe2a2f52d3.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_a5c1c311025a4e0fa4d96ea8c463fff7.pdf
    • https://static.usrfiles.com/ugd/b8c837_708fe6c2d1b544dd839c8f4c871f41a5.pdf
    • https://static.usrfiles.com/ugd/136d07_8557aad88d3a4d43b8e722c5e872e609.pdf
    • https://static.usrfiles.com/ugd/d1c05f_2c48a9cff3c84f5aa2ac2ee8861889a0.pdf
    • https://static.usrfiles.com/ugd/ab922d_5440c0123d9644d88e0f48358d1041b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.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_off00005627.bin
33ccf31c3c86a3cae5ed0a81c440e7ddb3382e7126f8af6e20b90dc3d38f6aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5627 5144 bytes
font_01_sfnt_off000067bf.bin
48030de154a9471c13f718f8d51b0dd85c4d6774af786307b2a4fb82445bf315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BF 14820 bytes

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