Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7d3850e95a6fd5…

MALICIOUS

PDF

80.3 KB Created: 2020-08-12 16:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d2a34afb09be7a2c66ccad1ef34616d SHA-1: 7acf3bcb4fb09c567a5a3d250b9522e5dcbaf52f SHA-256: 0c7d3850e95a6fd52252934798943dc7f58a63c3f90edb8a1794c66b676637ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one prominent link directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to a potentially harmful site for further exploitation.

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/pify?keyword=green+function+wave+equation+pdf
    • http://files.stoneycreekuniquedecor.com/uploads/1/3/1/3/131380042/9939549.pdf
    • http://files.eliteheatbuffalo.com/uploads/1/3/0/7/130775441/medinagap.pdf
    • http://files.donnasdressshop.com/uploads/1/3/2/6/132681448/8a813488ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/bill_bennett_about_donald_trump.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/kimonepafijuxevaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/15130312268.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/19552307969.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/58806993169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0447/9533/0717/files/eastern_shore_craigslist.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/zaverum.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/non_alcoholic_cocktail_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0436/8095/6569/files/61375575906.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9944/files/lidesugaxulasivorebi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8445/files/57903911322.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b5.bin
259dc60374146335f8d824e3ee3dc0a396e7c5abf7a9b4f775bc5cf4161029ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 5132 bytes
font_01_sfnt_off0000d74b.bin
8a061b8e4d513f03000a7fc0f53e8394466570c963f05ea54d0286a42f0a749d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 17380 bytes
font_02_sfnt_off00010e82.bin
673d3c2f0ea3cbb1d6a4204814925bc997278801dc679c6b567be6cc9b49a1b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 16568 bytes
font_03_sfnt_off0001257c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 4324 bytes

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