Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ade9176acd3241…

MALICIOUS

PDF

51.2 KB Created: 2020-09-02 21:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5df97e8f41c5469b1b22d8d8bb2588d SHA-1: 35ca1bc3958fc8e27682f8d553cb87a7fc8a1530 SHA-256: c9ade9176acd3241688bca48829deef57937660ada497ca021618b0266c5d467
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as information about business formation pricing. The PDF also hosts a large number of external links, many of which point to benign-looking PDFs on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. 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=formation+chef+d%2527+entreprise+prix
    • https://static.usrfiles.com/ugd/7921d2_fa3c85c45bf54696bc98b44ab27c8e80.pdf
    • https://static.usrfiles.com/ugd/69695d_238aa339d59a4d939c9fbe8bcce36a1a.pdf
    • https://static.usrfiles.com/ugd/19103d_fa62f2bad50d419db5ff30b3d8198a4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_664361dce9974642b505ccc14f54d4f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9efea030c12f4ddcbf79c469a37b49f8.pdf
    • https://cdn.shopify.com/s/files/1/0433/7706/6135/files/22080844498.pdf
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/31013334183.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6789/files/all_might_wallpaper_android_hd.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/asperges_me_domine.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/jaxigigasewadabuwadarowin.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/tezosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/knee_injury_rehabilitation_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/biology_notes_spm.pdf
    • https://static.usrfiles.com/ugd/d4579c_3f33a0f5714644d8943e8ce58af38f2d.pdf
    • https://static.usrfiles.com/ugd/162fe6_47f5655e40224b20b190b814e3fc780d.pdf
    • https://static.usrfiles.com/ugd/4c76bf_9444c5329aca49d6bebb2ea066670a37.pdf
    • https://static.usrfiles.com/ugd/b47706_d12d3f38103844e5b29834532b022807.pdf
    • https://static.usrfiles.com/ugd/769f78_b3fc4ca13d2f4952a3005d0ac247679a.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_off00007bd6.bin
66c9228f50acc5afa183b6c3b3a03ab2421b4aafb3619fa99796a3c9d47e9782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 5420 bytes
font_01_sfnt_off00008e24.bin
5441b608abbf2e942dd7929bfb2a2ef3e21bebf0fd5488ad56420ef412724fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E24 16420 bytes

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