Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5690d38eed1b4f7…

MALICIOUS

PDF

46.3 KB Created: 2020-07-29 08:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d055014a0e07801286b4001bc72539f SHA-1: 5f812e71d62dbbb4237da0c24f89f6f9a2349018 SHA-256: a5690d38eed1b4f70558dc369bc6008826499a9862c325837d6684063e887b79
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, flagged as a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=algebra+word+problems+grade+6+with+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'algebra word problems grade 6 with answers', suggesting a lure to attract users searching for educational content. The ML classifier also strongly indicated maliciousness.

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=algebra+word+problems+grade+6+with+answers
    • http://files.ballatsmithycottage.com/uploads/1/3/1/3/131379181/moxalare_wobonop.pdf
    • http://files.socalsocialscience.org/uploads/1/3/1/0/131070618/gegelubenenu.pdf
    • http://files.stylisharms.com/uploads/1/3/1/6/131637125/2899436.pdf
    • http://files.madras-culture.com/uploads/1/3/2/8/132814967/1661ebe4d4a6.pdf
    • http://files.socalsocialscience.org/uploads/1
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mituvazejuremoposanizama.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/muvidudam.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/50777989130.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/78734538624.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/watiledaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/33642091753.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/gutife.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/57608357976.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3697/files/wawiwovezufanejusafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/refafuzigopo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/67509553968.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_off000072e5.bin
0b7e4e810f5db6a45f814fbeda68f9488ded35397d5594bb513bdf5410f7a832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E5 5536 bytes
font_01_sfnt_off00008593.bin
190e8cae8f3bbd185e1d26f61ea254ed3a48aff03c4e688303bdcf78b0da4903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8593 11308 bytes

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