Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2d41056c3ea8e9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 20:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1b91aa3f01acca0dfd6e1b16ec0410d SHA-1: 87692aaf41b141dad5b71bd48348ee73a117a417 SHA-256: 8b2d41056c3ea8e99d14703874fc705c4049ee3d97ba35be52542ef2226722a7
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, appears to contain the same URL and references a PDF related to fluid mechanics, likely as a lure. The ML classifier strongly flagged this PDF as malicious. 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.com/wb?keyword=a%20text%20book%20of%20fluid%20mechanics%20and%20hydraulic%20machines%20pdf
    • http://guduruz.calvarygo.org/uploads/1/3/1/8/131856917/xojedejoxem-puboxivenudi.pdf
    • http://neres.acutabovelawncare.org/uploads/1/3/2/6/132695535/giladafamuso-gafuxolunewinu-zupofavitot.pdf
    • http://files.redsquirrelconservation.ca/uploads/1/3/2/8/132814030/1166259.pdf
    • http://files.richbrownies.com/uploads/1/3/1/4/131483830/424c10c8ec51a.pdf
    • http://xazib.thegreatwines.com/uploads/1/3/2/6/132682883/dajamofadepa-zosuliji.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/84903582282.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/25144614954.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/vagujowupemalazufoze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/mutuwejadimivip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/na_k_atpase_pump.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/togujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/95189922392.pdf
    • https://cdn.shopify.com/s/files/1/0431/6459/8434/files/sulud.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/classical_waterfall_model.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/20206098106.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/kotazijuzepubovi.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_off00005d70.bin
8871d6e4d20d9557d75e8a552cde8a3a94617306a6f75b271244bb50a5c36697
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D70 5760 bytes
font_01_sfnt_off000070df.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DF 2116 bytes
font_02_sfnt_off00007aaa.bin
536a0570aaed3ba84be9011337d1092349c473af2e4cb0ac51adf072cb727dda
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAA 14504 bytes