Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ce1ef2c930164…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 14:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c2415db7f1f33684e1960cfdd0de0d SHA-1: 10a62a5f9a155aca7fd07cc452d749b0a17a87d7 SHA-256: 991ce1ef2c930164f7116c5d3e620682c9852a05f954641fcc8a7a1c7e3e2749
92 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, https://ttraff.ru/wix?keyword=reefer+temperature+range, is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is sufficient to classify this as a phishing attempt.

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.
  • 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=reefer+temperature+range
    • https://static.usrfiles.com/ugd/76b6de_9d96d9837dce4889a7f93702598dd238.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_f5b2f75458074564b2cd1a5de066eb40.pdf
    • https://static.usrfiles.com/ugd/b8c837_3145514fadbc403c980e1205c7af80c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_665cf2c14ae843bfb5d9ccd3087f63af.pdf
    • https://static.usrfiles.com/ugd/b8c837_451c29b0534c40898134d3f27dac7462.pdf
    • https://static.usrfiles.com/ugd/7c30af_23d678de773945f591e6c3fff50caffc.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc2c3690156841729add3e999934dfc9.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/18905389831.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/piwuxezebaz.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_off00005ce5.bin
35962ea25eae5eeb2041834835fc864e48875fe0f8b42a87be1689c3806238cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE5 4740 bytes
font_01_sfnt_off00006ce7.bin
ed1fbf46ad9a632ed0ef40ca9252a53f8361f8bff9bac6f161aa75d6b8ecb58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE7 10344 bytes
font_02_sfnt_off00009038.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9038 4324 bytes

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