Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfb74d28ed0b98f…

MALICIOUS

PDF

33.4 KB Created: 2020-10-04 03:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1afa147cdcf8fe265bd8952d89fb5bf SHA-1: 27f1cabc8d7fd951f5d3992faf92e6bb79803cb4 SHA-256: 7bfb74d28ed0b98f974de9946c5a270d784b2eb17e060eae23c7c68fb45c34b4
92 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, indicating a likely phishing or malware distribution attempt. The document body, though heavily obfuscated, also contains the same malicious URL, reinforcing the intent to redirect the user. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of a malicious intent.

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://gettraff.ru/strik?keyword=sao+swordland+mp3+download
    • http://files.wonderpin.com/uploads/1/3/1/0/131069893/abd9dc.pdf
    • http://files.kirkmahoe.com/uploads/1/3/1/4/131483719/8758137.pdf
    • http://files.fromthelighthouse.org/uploads/1/3/2/6/132695472/682935.pdf
    • http://files.compromiseof1790.com/uploads/1/3/1/3/131398591/lizumu-nakubibobij.pdf
    • http://files.courtwatchma.org/uploads/1/3/1/3/131380930/fujijeka-vutoj.pdf
    • https://site-1036830.mozfiles.com/files/1036830/78403129934.pdf
    • https://site-1040003.mozfiles.com/files/1040003/xiduzav.pdf
    • https://site-1038531.mozfiles.com/files/1038531/76628239210.pdf
    • https://site-1040785.mozfiles.com/files/1040785/kaxiverujezo.pdf
    • https://site-1036753.mozfiles.com/files/1036753/53364930778.pdf
    • https://site-1041857.mozfiles.com/files/1041857/34122895978.pdf
    • https://site-1038699.mozfiles.com/files/1038699/jometuxupeponafu.pdf
    • https://cdn.shopify.com/s/files/1/0493/4418/4474/files/56539582556.pdf
    • https://cdn.shopify.com/s/files/1/0477/1319/0044/files/piedmont_soaring_society.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_off000043fe.bin
05bc41cf6e035c1472a876938e1681e7480f48f04f5533b3465affcaddcbd1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43FE 5464 bytes
font_01_sfnt_off00005689.bin
a43630676b88ef1e1b3a7a0aa24aced3b548871507983c54866bd207996fe9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5689 9992 bytes

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