Malicious PDF — malware analysis report

Static analysis result for SHA-256 c490bf5b2e2bacc8…

MALICIOUS

PDF

42.6 KB Created: 2020-08-24 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27800274aa047ff70e50809f3d86e9d1 SHA-1: d823ca326ba86ab4af0c26ba4b13ccc9781691dd SHA-256: c490bf5b2e2bacc887e4304021d009da8e5e4450a24d9f1a1c14d0b651500c2a
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=layers+of+the+sun+worksheet'. The document body, though heavily obfuscated, contains references to 'Layers of the sun worksheet' and the same malicious URL, suggesting a lure. The presence of numerous other PDF links hosted on various domains, many of which are benign but some are unknown, indicates a link farm strategy, likely to obscure the primary malicious destination. 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.cc/pify?keyword=layers+of+the+sun+worksheet
    • http://files.geraldsandau-sculpture.com/uploads/1/3/1/0/131070633/9625127.pdf
    • http://files.thepaintbarpaintings.com/uploads/1/3/1/3/131379262/bobazowe.pdf
    • http://lomesu.kristineasselin.com/uploads/1/3/1/3/131378960/7522026.pdf
    • http://files.mahamevnawasaskatoon.com/uploads/1/3/1/3/131398244/bijuxijejinewo-jujugizid.pdf
    • http://files.avalonhalethomson.com/uploads/1/3/1/3/131383791/dewijipajuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1477/files/80721855352.pdf
    • https://cdn.shopify.com/s/files/1/0431/8003/2160/files/fabekepuvikeselebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/sakazexovajufog.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/gadinojowanoxafixigusu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/20570602652.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/mathematics_probability_and_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/febuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6287/6565/files/sodapatakibab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/nipuwo.pdf
    • https://cdn.shopify.com/s/files/1/0464/2403/1384/files/choices_hacked_version_ios.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/jofuveda.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/71931422994.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_off00006922.bin
fe79ab16c95cb8cad816991962b79cc46c3e6bb497a4c7d9980251ab0f79b9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6922 5024 bytes
font_01_sfnt_off00007a51.bin
a1cdc4af5f21d439417468bb93d808ff64ea6db559e0ca064a8ffd58326acd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A51 10232 bytes

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