Malicious PDF — malware analysis report

Static analysis result for SHA-256 6671e5d078ea8af5…

MALICIOUS

PDF

34.0 KB Created: 2020-08-04 09:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35cd16f592309c275b23e5040649a0e2 SHA-1: 72bba4c05b4cf84a6d7b70a9201c5f0f025bad41 SHA-256: 6671e5d078ea8af5ab347582c40b7cab84bf28c7c426cf2e7f75f3ad10821559
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to manipulate search engine results. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to potentially harmful websites.

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=envision+math+grade+2+topic+1+pdf
    • http://files.battlegrounddance.com/uploads/1/3/1/4/131407796/xujoxunoromosupu.pdf
    • http://files.charlemay.com/uploads/1/3/1/4/131407668/e4e6745833ad.pdf
    • http://files.casualcorvettescsra.com/uploads/1/3/1/8/131857304/7549186.pdf
    • http://files.yourbesthealthbyfriday.com/uploads/1/3/1/4/131453193/kepig_dalixe_wopupozonalem_todugomere.pdf
    • http://files.omgyummy.com.au/uploads/1/3/0/7/130775268/8520325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/alternaria_tenuissima.pdf
    • https://cdn.shopify.com/s/files/1/0430/7134/0698/files/favonikafokirukuz.pdf
    • https://cdn.shopify.com/s/files/1/0448/2344/5666/files/search_engine_marketing_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/pumakij.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/california_eviction_defense_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6568/8743/files/bipet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0560/7079/files/gixulukivupunatexosemav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/72715282765.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/womixaxeferez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3396/files/mumesogomuzetegebufer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/fajuxogetozideruwazun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/wozoroligawomopokis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/m1_garand_disassembly.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_off000047bb.bin
4b75eed7dd4df9053cfafecd4d6ce30d08dad4a449abff8a57955a641624ac47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47BB 5736 bytes
font_01_sfnt_off00005b30.bin
220e5af3368d8d61f67fa399bda0d2240e3cccab3fcefb0b5169096354a1e964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B30 9328 bytes

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