Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d3f533195b6138…

MALICIOUS

PDF

41.3 KB Created: 2020-08-06 20:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01be2c8a5fe48a1ffd359824a4fa92f5 SHA-1: f41183c2e6e0420e201291e38d90617376200182 SHA-256: 44d3f533195b61388d32da204d13ff0dc20d9c1b8f48fb2a28612c1a315d5a0f
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a worksheet. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. 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=romeo%20and%20juliet%20act%202%20scene%202%20worksheet%20pdf
    • http://files.emilydeckerdesign.com/uploads/1/3/0/7/130776655/352919a22e0.pdf
    • http://files.roominghouses.net/uploads/1/3/1/0/131071114/werenepaxuti.pdf
    • http://files.spgallagher.com/uploads/1/3/2/8/132816066/visebaju.pdf
    • http://rixuz.thenewgrassroots.com/uploads/1/3/1/1/131163635/joxekedupug_vumupuruxawibo_wilepubimisiwak.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/56623005169.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26433336276.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/66757734929.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/32815190623.pdf
    • https://cdn.shopify.com/s/files/1/0440/6371/9574/files/23046070268.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/3d_shapes_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/kojam.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/apache_score_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/ninoburi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/48380228581.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/pedewowonoxezemadov.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_off000062e2.bin
1182bd4fa95358acfded32a03272c6e45a00503aff5908d8bf0be8693a9fbd3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 5768 bytes
font_01_sfnt_off00007677.bin
4946d41866d9ca0ba86a99657169082537984a6ab1cd491907b4f2aa288e9ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7677 9844 bytes

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