Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9adeb2b2b42006…

MALICIOUS

PDF

47.6 KB Created: 2020-07-21 06:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09e13447cfb962e02561d793553ee82f SHA-1: 9e02e64cd2982be2f4bb7eed62526d2bb258f2e9 SHA-256: cd9adeb2b2b420066b821b75d241d0a64aacfb3543aa581f4ff29fc9151cb265
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a book summary. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The ML classifier strongly indicates maliciousness.

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/wb?keyword=the%20minister
    • http://files.5ivecoffee.com/uploads/1/3/1/4/131409693/xuvonomivegu.pdf
    • http://files.ratt-ru.org/uploads/1/3/1/8/131871494/litasuwadefaliv.pdf
    • http://files.catharsisfightingthedrugepidemic.com/uploads/1/3/2/7/132741764/1f82c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/kitagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/buxalulizevudok.pdf
    • https://jagenanevor.files.wordpress.com/2020/06/59152118971.pdf
    • https://legebepome.files.wordpress.com/2020/06/99743388653.pdf
    • https://namilarom.files.wordpress.com/2020/07/zabubafotemamoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/gegawagukavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/3942139641.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/95431571642.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/vowinu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3612/2008/files/gojanenatemerekosaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/5280334093.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/kezew.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/48995766622.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/24907566890.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/
    • https://legebepome.files.wordpress.com/2020/06/99743388653.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c27.bin
d2a68cbf43bb7e22c64743036a5e5ef3b2de273f54ff2bfd5f07022e04d155af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C27 5516 bytes
font_01_sfnt_off00008ec5.bin
6d2af021c8d076b153a23733d43bf82740df195bee91ee545de82aca684902e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC5 9976 bytes

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