Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b4d8f661c56ee9…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 17:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a80c34ec7bddb3ac45e8264298908b SHA-1: ea437c696a73ad3b7a7110f0c9deba6d21077181 SHA-256: 74b4d8f661c56ee94a0bd8b4ef71ad7efb910f9dde8c87b9d014d02c6e4fcc86
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=reported+speech+rules+class+8'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com, suggesting a link farm or redirection strategy. 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.cc/wix?keyword=reported+speech+rules+class+8
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/87522327879.pdf
    • https://cdn.shopify.com/s/files/1/0438/0812/9185/files/carita_feliz_formato_png.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/noledogokeduworu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/73302372619.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7541/files/tategumuwaruzixap.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/58837530472.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4673/files/xubikufuwuwofugur.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/wojuvelonoxonixowo.pdf
    • https://static.usrfiles.com/ugd/b8c837_712b200d63af4270b27f251c76599bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_321509018dc64367ae7f55a15431404a.pdf
    • https://static.usrfiles.com/ugd/625844_a2cd5b3b6bb44de382a7afae58f09652.pdf
    • https://static.usrfiles.com/ugd/2ac701_161d1d6cc3bc46f482b2d0295d1d7a45.pdf
    • https://static.usrfiles.com/ugd/6f7357_c455e242216e4929bb736c4bb8b7a1a7.pdf
    • https://cdn.shopify.com/s/files/1/0434/3916/1500/files/prueba_de_coombs_directa_fundamento.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0498/files/33338420254.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/kevine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cf.bin
52cfbcc6d33c082c2e27971cf829744f8bbb06bb4880cc719a4acc76ffb636c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 5092 bytes
font_01_sfnt_off00007834.bin
35048280d4290a3f94e9d9965938004a8d963b6425d039d28914ad206d799334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7834 10192 bytes
font_02_sfnt_off00009aa8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA8 4324 bytes

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