Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d91beaf4443b65…

MALICIOUS

PDF

46.2 KB Created: 2020-07-23 03:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6419682440402f0ca98eabdec2e78b17 SHA-1: 200fbbdb29498e662327247b39672a554afd409e SHA-256: 07d91beaf4443b653b4cffa1d031aca9ac5bcd1451a684dc3558f91c89933f06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended content beyond the presence of links.

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.com/wb?keyword=judge%20lynn%20toler%20book%20pdf
    • http://files.thethinkingnurse.com/uploads/1/3/1/6/131607683/8574619.pdf
    • http://files.bethbooram.org/uploads/1/3/1/4/131437493/4358940.pdf
    • http://files.suzielhafez.org/uploads/1/3/0/8/130873717/puzoduzinowumapo.pdf
    • http://files.onpointc.com/uploads/1/3/2/7/132740905/9384950.pdf
    • http://files.rbeauchampgallery.com/uploads/1/3/1/3/131382092/mumilolitimewafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/dofiwewopimuzalisu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/16006284405.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://sidakosobo.files.wordpress.com/2020/07/sesazijapenukap.pdf
    • https://zoluvarij.files.wordpress.com/2020/06/35913945339.pdf
    • https://punutezelo.files.wordpress.com/2020/06/40467509867.pdf
    • https://bemivoz.files.wordpress.com/2020/06/64475987974.pdf
    • https://cdn.shopify.com/s/files/1/0436/4658/2944/files/34655882342.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/gugisex.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/39547005225.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/27525691330.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/80232397285.pdf
    • https://cdn.shopify.com/s/files/1/0441/0173/0456/files/mewezaxobiwidaseto.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/88634435316.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_off0000784b.bin
d6dfc021f08a32f07a837ca1776dfa8dd108a0b41a1205ab621eceffda9400b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 4948 bytes
font_01_sfnt_off00008936.bin
a50d84b600b3de275ac728bf2131d63691c24bb7702095330143a998171bd3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8936 10008 bytes

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