Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de6836f59231299…

MALICIOUS

PDF

38.0 KB Created: 2020-09-02 02:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35da2c99af42485c0f4be0a56aa077b8 SHA-1: 70ab42e2e2e208d626ee5e9dd857f5ca2b8e06a0 SHA-256: 6de6836f5923129932d992a665eee0341cc19a88baae79c73d60cb6e87a0bed4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure for a "free PDF to Word converter" to trick users into clicking the malicious link. While no scripts were explicitly extracted, the nature of PDF redirects often involves JavaScript execution to facilitate the redirection.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=free+pdf+to+ms+word+converter
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/soxejoxivugipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/wemisojofubuvumifumexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/90407038929.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4334/files/ku_b._pharmacy_syllabus_copy.pdf
    • https://cdn.shopify.com/s/files/1/0430/8877/3269/files/wuwaremido.pdf
    • https://cdn.shopify.com/s/files/1/0439/6207/3246/files/add_and_subtract_integers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/jivizurunimupamaxusal.pdf
    • https://static.usrfiles.com/ugd/de60da_b8a6f6462e374dbb954cf6c2bf353024.pdf
    • https://static.usrfiles.com/ugd/07625c_57bcef7c727943b1be9215ed974c723b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a9.bin
ae1dc71089acef473e79daf61a89f66844b2696f5c73b520a644f273ed3d0328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A9 5164 bytes
font_01_sfnt_off00006949.bin
c28e60962e65934b77b612bf7da6cc3b6637084d9ea228cd42e77558b05f3d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6949 10084 bytes

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