Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce56dad70bc275a…

MALICIOUS

PDF

37.3 KB Created: 2020-08-30 06:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3dcd7721ad6f41bbeba619daecc4f6 SHA-1: 62dc2356984d0e7f37c4b6df9085a8a42605cc54 SHA-256: fce56dad70bc275a96609a803ffca63d8ee24fbb4ef0297d557aef63c0f27647
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for a free investment guide. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a malicious link embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.ru/wix?keyword=the+only+investment+guide+you%252527ll+ever+need+pdf+download+free
    • https://static.usrfiles.com/ugd/b8c837_98e279dc3146423d9d3f09a5c0db0f5e.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_6d937ff2570443349f1db2afd6ac4902.pdf
    • https://static.usrfiles.com/ugd/b8c837_65753c6de48c4181ab587ea8a8e608a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e86014b048824a74878115a6e0dce615.pdf
    • https://static.usrfiles.com/ugd/dad90e_b33b06fd1e1c46708d8c9772b23a06f3.pdf
    • https://static.usrfiles.com/ugd/d01287_0c0fe4ce6b9e434486dac8840cd945e1.pdf
    • https://static.usrfiles.com/ugd/79cb75_0e594db26bf44a03893f575dd1fcc434.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_9d1141367a364866b38df7064c5c5a47.pdf
    • https://static.usrfiles.com/ugd/b8c837_2832e418af6d455aae9d5866b4f4d745.pdf
    • https://static.usrfiles.com/ugd/87b9a8_7bd45c971ca04df2b0e43ac7696a03ab.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_59407c40828d4eaab8be58a4b1659b90.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_off00005141.bin
f037ae1b8879f5aad93435c3d8aa9f489c8802b0e291e48627a8fc1f366b20e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5141 5692 bytes
font_01_sfnt_off0000649a.bin
4dad03dd45c785b36d96311af29fa2baf2f022d678a3eed0ba3a7d29d71cdde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649A 10484 bytes

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