Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fbe425f432f8be…

MALICIOUS

PDF

41.7 KB Created: 2020-08-21 23:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04027c0c2e412a640b13904b13e5eaa9 SHA-1: cce54e3071e569bbd8818d8810a44a8b626577a5 SHA-256: a8fbe425f432f8bedbd20a8b97b4be37d491568f49c64d1b7f9bb3c6ab494b84
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Override

The PDF contains a large number of embedded links, many pointing to external PDF files, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains the text 'Alphabetical order worksheets for first grade' and the malicious URL, suggesting a lure to trick users into clicking on potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=alphabetical+order+worksheets+for+first+grade
    • http://govapux.impactliberiamissions.org/uploads/1/3/2/8/132814930/1716220.pdf
    • http://files.ashtonavila.com/uploads/1/3/1/3/131398143/kanozirik.pdf
    • http://lipulig.neonslushie.com/uploads/1/3/2/8/132814930/5540379.pdf
    • http://tunumure.messiahsreturn.com/uploads/1/3/1/4/131410007/9102578.pdf
    • http://wimal.lovejennynkaujnag.com/uploads/1/3/1/6/131606875/liximu_begeluwunaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/xefufegijoxijaxasuniraze.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/ahle_hadith_books_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/lidepasikepizewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/94972413526.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/govos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zebegevuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/65172737372.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/83702367517.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5195/files/fejewivawu.pdf
    • https://cdn.shopify.com/s/files/1/0466/3250/1413/files/genetics_definition.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_off0000629f.bin
8b47fa01c29c8b15adf1b578ea384e3a03e95be7896dd5bb86f0e06e0449ef46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 5700 bytes
font_01_sfnt_off00007601.bin
57a8deb968900c7c56e20558a9234c386daf1d7c8fe8d2347eeb07a670ef613f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7601 10412 bytes

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