Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edf1196a7f4300c…

MALICIOUS

PDF

56.7 KB Created: 2020-08-07 12:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b03f94d5a7580487a2b8b5a646ff16f0 SHA-1: 878d611eed81e63f69c56e590570f4f42de45c0a SHA-256: 5edf1196a7f4300c0dc3f3941302862fd9d4727da8317bc72729c225cb6c7bf1
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 PDF files hosted on various domains, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure.

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.cc/pify?keyword=bilangan+berpangkat+dan+bentuk+akar+pdf
    • http://files.letspaintarabic.com/uploads/1/3/2/8/132815123/lilezezedumisuvix.pdf
    • http://juzaroz.trishgipsonphysio.com/uploads/1/3/1/4/131454012/8ff6e6bc9d20.pdf
    • http://files.chefstaceyjean.com/uploads/1/3/1/0/131070149/kijozipazuxi.pdf
    • http://files.ridgeclinicairliebeach.com/uploads/1/3/0/7/130775310/2d2f113.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/48380420321.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/bexudasolegiluk.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/80896872024.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/37699909520.pdf
    • https://cdn.shopify.com/s/files/1/0436/4442/0246/files/19437531811.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/zolemuwir.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/enlaces_quimicos_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/63290808069.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/zedixilevipadus.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/72434779497.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/cs_go_dragon_lore.pdf
    • https://cdn.shopify.com/s/files/1/0438/6937/2576/files/56053875504.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/naduz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b61.bin
0eb142c52816054b6d92cd9a990a7bd6592ced3f8468d2ad03c6a7dc2e430c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B61 5284 bytes
font_01_sfnt_off00008d69.bin
967615ca27e2a862ebf92faccdbd689ec676eb67f7716b6528a28e123fc7c6e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D69 15644 bytes
font_02_sfnt_off0000be80.bin
edcbf3b43dc98dd899dd6f2502067bc75ea794ab80d0fffa78249883a83a8cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 17024 bytes

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