Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d61d4bd8d35a7c7…

MALICIOUS

PDF

34.6 KB Created: 2020-09-17 04:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f54cba9c6e83b5cce95f72596060aaa9 SHA-1: 00f38225cd4fc55105607f09d2d876491f6aedfd SHA-256: 7d61d4bd8d35a7c72f6cfbbc49be741bb3868fbd744b3d0d81bf0100a9eeb850
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Kessaris watch reviews' and the primary malicious URL, suggesting a lure. The presence of a link farm further indicates malicious intent, likely for SEO poisoning or driving traffic to malicious sites.

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.club/wix?keyword=kessaris+watch+reviews
    • http://wimijo.phoenixtravelglasgow.com/uploads/1/3/2/7/132740873/7977772.pdf
    • http://files.cartravelsafety.com/uploads/1/3/2/7/132741535/mosijodaw_bomodojopivefut_javuradisede_luwinite.pdf
    • http://dapefa.utahstudentnurse.org/uploads/1/3/1/4/131438304/vezoziwofu-nobizobenofusu.pdf
    • https://76b16949-3664-49eb-a989-f700e9f83932.filesusr.com/ugd/10cedf_3f587ef79b80496d9bfa78e7707e6420.pdf?index=true
    • https://b30b188c-95c1-437c-83bb-e4eddaa33b22.filesusr.com/ugd/ceb2e8_c6e44a46158c4fe5b5eaa74cf5a63288.pdf?index=true
    • https://735c0868-4d45-46c4-b23a-ffd36e08e37a.filesusr.com/ugd/defcb2_4a4c32b585544342aa88be3c7ec3a259.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4995/1140/files/juwexijanavupupuxiguji.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/boxupeloriwibagolevusoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/guzufirukevoditatodirerox.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_off00004aaf.bin
5b77e53d33dd9652e0e1bb9eb757a3737c0b094408f6e607d6be6a4bf5aa7635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAF 4976 bytes
font_01_sfnt_off00005bb2.bin
16c52fcae07eca4772aed446d43e878e6bb5885777fd9d300c4894a7b67c777e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB2 10128 bytes

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