Malicious PDF — malware analysis report

Static analysis result for SHA-256 824436d1d565c93e…

MALICIOUS

PDF

38.1 KB Created: 2020-08-29 18:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 136532f2221b5bc23c74623117ba13bc SHA-1: ccd25d5ba431487fff5ca5baeb0995f97cb070fc SHA-256: 824436d1d565c93e02509ddae35408845b8014748d42f59b85688395173d8939
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent link, however, directs to 'ttraff.com', identified as a malicious redirector. The document body, though partially corrupted, contains the URL and keywords related to wallpaper generation, indicating a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=birthday+wallpaper++with+name
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/18_chun_li_mugen.pdf
    • https://cdn.shopify.com/s/files/1/0435/6967/6451/files/avr_asm_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/cracked_games_sites.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/bijur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/11672912332.pdf
    • https://static.usrfiles.com/ugd/b8c837_c53fce6494ad447ebf461da4fc0fe626.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc102151c145408da4fd1d363b2187d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_597334cfbf8640bda3fc95b1db107224.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/arifureta_light_novel_volume_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9616/files/mawisugubelabilonuvezu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/38256670519.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/25281414031.pdf
    • https://cdn.shopify.com/s/files/1/0431/7544/4631/files/16053794931.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/solasamu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/fopemujebinusokag.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/porunga_dokkan_set_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/13854933553.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/99034745259.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000581b.bin
8c300ecd2c2e0871d5dbfc4087360816e9881fe9121d5cb545c23f5b74748d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581B 5264 bytes
font_01_sfnt_off000069e8.bin
14942a38ee432856a76304c45e01a3dfc8861fa98b8d43bd2fa3cc971b20be87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E8 9896 bytes

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