Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b7e618aa2bfc49…

MALICIOUS

PDF

45.8 KB Created: 2020-08-03 02:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e016eef0dfb8bc21e442da00c5b4e203 SHA-1: 93f76ec0ef4f1a3103ce24b36c72ff814e5b79ec SHA-256: 87b7e618aa2bfc49d8d38822798826f63d256f154087662a2407f866ddb8a4eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/wb?keyword=nativity%20certificate%20format%20pdf%20ap'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for malicious content.

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/wb?keyword=nativity%20certificate%20format%20pdf%20ap
    • http://files.ygnaciocenter123.com/uploads/1/3/1/4/131437941/pimawuxadovofid_roremubodaxonoz_wapibol_vutuw.pdf
    • http://files.franksflybox.com/uploads/1/3/2/8/132814791/1fd6ae925f.pdf
    • http://files.tavah.net/uploads/1/3/0/7/130740049/nidowemusosit.pdf
    • http://files.teachingreexplored.org/uploads/1/3/0/7/130775393/5274901.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/68266318139.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/99554191720.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9366/files/befakejonob.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/xilawobusukadivegusevum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/91700266219.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/vikodudisitusotoludapoten.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/9120064206.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/logukatidelafilep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7184/8100/files/20550379850.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/nizimeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/what_is_an_instance_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/gikalatozuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/xilodavil.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006802.bin
fd59f2306432d7e0fa34d58e4a32ff4e8076ea9b4f6a074e9aac3e3f382fea5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6802 4904 bytes
font_01_sfnt_off000078be.bin
61a232451fd87aea8d06a169aca01bfa1d11e7eb34e27f80c38100020293336b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 10208 bytes
font_02_sfnt_off00009bae.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAE 4324 bytes

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