Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ad39800de5c3fa…

MALICIOUS

PDF

37.6 KB Created: 2020-08-18 20:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd9e5b21fbceb1f656254cea1e57133 SHA-1: 2a94035f5fc3e06044c0a73da8d7d61922b00139 SHA-256: b4ad39800de5c3fae8ce861c4ffff52d27af939a09485faff82ff2691a84f3f3
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to ttraff.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL. The presence of embedded URLs and the redirector link suggest this PDF is designed to lure the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=catholic+answers+fullness+of+truth
    • http://xukoxe.sheeshees.com/uploads/1/3/0/7/130776728/aaef0b60c6.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/svg_to_ico.pdf
    • https://cdn.shopify.com/s/files/1/0438/3178/7670/files/pct_applicant_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2982/2631/files/kujosizak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8340/files/cours_pour_apprendre_l_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/dobigepitudedaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/gelunexiliru.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_off00005a1d.bin
f6d1e162d8c5ae95cb064fc8b46bd2cd4587e9189a45bfcf7f9b194fcf2da45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1D 4964 bytes
font_01_sfnt_off00006b06.bin
5204abffc0eb0793733ac225b870106dbe565724a93db745b690bd9b1d527b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B06 9180 bytes

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