Malicious PDF — malware analysis report

Static analysis result for SHA-256 187794e69996dfd2…

MALICIOUS

PDF

43.9 KB Created: 2020-09-04 08:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a04c5b21f41c1c8c128c9198e9889057 SHA-1: 91b391e82328ffe766d3863aae91d3c20e018e1e SHA-256: 187794e69996dfd23f8e23db0f5eaeb92f31b25ab11218f6bf64d473a52531b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=acetal+and+hemiacetal+formation', is designed to lure users. The document body, though heavily obfuscated, contains this URL and other links to what appear to be SEO-optimized PDF files, suggesting a link farm or redirection scheme.

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=acetal+and+hemiacetal+formation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0446/9896/0026/files/microsoft_ehome_infrared_transciever.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/57884139731.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/85213684498.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/acute_hyperphosphatemia_treatment_guidelines.pdf
    • https://static.usrfiles.com/ugd/5de1df_56910a66e97d4bea81e23e5302ddb8c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb835e4e5b2b4850a9dce70c08322263.pdf
    • https://static.usrfiles.com/ugd/b8c837_2da413f5cc3649dbbd2e5839352d23f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde285ca2f0545b58b282b894a371ec7.pdf
    • https://static.usrfiles.com/ugd/cf14a4_fb087c768f194e798b41b85c895fb4fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_73340e03bf734e0db3ff44b49dbedbd9.pdf
    • https://static.usrfiles.com/ugd/253000_023e233af14f44d2861e0bf81b2d539d.pdf
    • https://static.usrfiles.com/ugd/5ea691_f730c9ee9afb4adba55a8b9280e7d098.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/25461748407.pdf
    • https://cdn.shopify.com/s/files/1/0434/4099/6519/files/rafutuzutek.pdf
    • https://cdn.shopify.com/s/files/1/0469/9697/9864/files/1364209662.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/statistical_analysis_of_data.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/mixapipi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000617c.bin
25b843fdc8895cc0b77c607d0a7eb60fe9633895ac2abe8044f98d93f34b2d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 4860 bytes
font_01_sfnt_off000071bf.bin
b5fe25208e116725b0b66b198d9103a6daf5bfdfb027afde63882b7750f55e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BF 10324 bytes
font_02_sfnt_off000094b5.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B5 4324 bytes

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