Malicious PDF — malware analysis report

Static analysis result for SHA-256 983bc5aa17b6c8d6…

MALICIOUS

PDF

57.3 KB Created: 2020-08-30 00:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95f8805aaea82a5a2573bb94e0648ad2 SHA-1: dc9b73ddf66063710b95ea8006fec5e48d8528b8 SHA-256: 983bc5aa17b6c8d6d3ec82183d58734dd4e804e79212920fffd01202fd73dec5
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though heavily obfuscated, contains the same URL found in the heuristic. The presence of numerous external links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. No scripts were extracted from this sample.

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/wix?keyword=sel%25C3%25BBne%252C+goddess+of+the+moon
    • https://static.usrfiles.com/ugd/b8c837_da597b5dc8d14027ba045ec08f63c16b.pdf
    • https://static.usrfiles.com/ugd/1cfe37_b251186ec76540bfbe4ab7306a305090.pdf
    • https://static.usrfiles.com/ugd/07625c_fb2a92679c0b4746bf380f2a7f4ce30a.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_bad3f64b61ee4a77843559cb8022fa40.pdf
    • https://static.usrfiles.com/ugd/3cb679_f8ebd3a12ed84f3fa45b38c6a39ed937.pdf
    • https://static.usrfiles.com/ugd/3fc21f_6a4b61a39e9940fe9fd630f78189a1c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_2add61c2764c44468a3083442cb4b740.pdf
    • https://static.usrfiles.com/ugd/2ac701_1609a440b66f4c10bdd21019a3cd81ec.pdf
    • https://cdn.shopify.com/s/files/1/0437/5796/1365/files/65010912267.pdf
    • https://cdn.shopify.com/s/files/1/0434/3450/8454/files/the_chemistry_of_nanostructured_materials.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/1409098862.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/lusamexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8724/files/kegisefesuzekenepafifo.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_off0000a0da.bin
169cdef74665ff643dd2bea2ae9e806a3195b203065d8cba0295abc5cb466e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DA 5296 bytes
font_01_sfnt_off0000b299.bin
3834e30a09218c016314e7fccc9016e59774a0064827c75c02db1cccfd191fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB299 10764 bytes

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