Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7133791978c336f…

MALICIOUS

PDF

39.3 KB Created: 2020-08-15 18:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0085e40cefb4ef59640b66bbdcb9ed3e SHA-1: 4b910bed531014c7300722d27830ae055f79f7d1 SHA-256: a7133791978c336f3f9ceb25c9b9bbf2f1dad586c0efcbbaf87086e2894c7cfa
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The document body contains a URL that appears to be part of this link farm, suggesting the primary purpose is to manipulate search engine results or redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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.ru/pify?keyword=amazing+spider+man+3+wallpaper
    • http://zizonago.scoresgrill.ca/uploads/1/3/1/3/131398140/9605bb5f7b94b1.pdf
    • http://files.your4legs.com/uploads/1/3/0/9/130968961/dibibugulapa.pdf
    • http://files.setauketmeadows.com/uploads/1/3/0/7/130775725/7763017.pdf
    • http://files.wbabaseball.com/uploads/1/3/1/4/131438539/wajivafud-retuwof.pdf
    • http://files.renebernardnovel.com/uploads/1/3/0/8/130815311/dibutefezenalujofub.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/66045345008.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/45934226598.pdf
    • https://cdn.shopify.com/s/files/1/0437/3194/3585/files/kufagino.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/tozumetigubozim.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/69312346431.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/22575171071.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdf
    • https://cdn.shopify.com/s/files/1/0434/9234/3970/files/fiwofemezibejetenaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/what_does_enchantment_mean.pdf
    • https://cdn.shopify.com/s/files/1/0432/0536/1821/files/65837333736.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/crf50_service_manual.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_off00005b76.bin
284b959db69f5db37b4da52447046da67f9f43d971228f6b79379bfb8309abcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B76 5572 bytes
font_01_sfnt_off00006e64.bin
e7e6ecc0ac9645e8880d8b864292ec3c0f44a1e458382df388dd4151a6dbcf9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E64 9992 bytes

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