Malicious PDF — malware analysis report

Static analysis result for SHA-256 838ef885b00df6cd…

MALICIOUS

PDF

47.3 KB Created: 2020-08-14 05:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28a735a7678bdc8d5f57c2323115eafc SHA-1: f9718eb8cf88b33cbde87062382b44373bac12f7 SHA-256: 838ef885b00df6cd623cb8596872d2b7536be5994f02bcd3a6111db18308ad6a
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 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'edexcel c4 maths textbook answers' and the malicious URL, suggesting a lure to trick users into accessing potentially harmful content. The presence of numerous embedded URLs, many hosted on shopify.com, further supports the link farm heuristic, indicating an attempt to distribute malicious content or manipulate search engine results.

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/pify?keyword=edexcel+c4+maths+textbook+answers
    • http://files.littlesunshinespreschool.com/uploads/1/3/0/7/130776131/3a54db06f.pdf
    • http://files.1enchantedcraft.com/uploads/1/3/1/0/131070394/tamodubog.pdf
    • http://files.paradiseprintsfashion.com/uploads/1/3/2/7/132712306/3c186a93c6b.pdf
    • http://files.scottwilson3dartist.com/uploads/1/3/0/9/130969776/a03e9.pdf
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/20347302553.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/futelebojesebigirodisujor.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/dinonidupewisuwexakasud.pdf
    • https://cdn.shopify.com/s/files/1/0435/2278/5444/files/26021168063.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sexewagufik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/fitixosulopiviwineb.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/zumik.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/67309220776.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/lyman_turret_press.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/vinofipub.pdf
    • https://cdn.shopify.com/s/files/1/0447/8110/9405/files/10551129491.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_off00006d37.bin
fa9dc2291a5765a235723f887e99b7c466642b4f4439217f6c84b10410eff138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 5588 bytes
font_01_sfnt_off00008020.bin
86f0008032937d8cd80ca1aa0e0ab466faad2f614625b205a638e9dbaa66bb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8020 3176 bytes
font_02_sfnt_off00008caa.bin
15870632ee67d9e1e9de7f6ae9247f8f36eb5a4e782deca9fd80af6d6814d4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAA 10232 bytes

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