Malicious PDF — malware analysis report

Static analysis result for SHA-256 c158158c77e986c1…

MALICIOUS

PDF

43.9 KB Created: 2020-08-01 03:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 429bf8ed715928e73cd1557efda0c7c1 SHA-1: 9be81361643e0e455bf3637d0ad86ae37b88e48e SHA-256: c158158c77e986c1de214399dfe49b6920b1632a7a8512cbdf2e8b6a744b9eaf
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many hosted on Shopify, suggesting an attempt to create a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=php+close+tags, which is likely used to redirect users to malicious content. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely programmatically generated.

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.com/pify?keyword=php+close+tags
    • http://files.texasconex.com/uploads/1/3/1/1/131164479/zojifar.pdf
    • http://files.stickandstrum.com/uploads/1/3/1/4/131438228/d15c68bea.pdf
    • http://files.sloanesquarehotel.co.uk/uploads/1/3/0/8/130813846/176451ae2d9ec0.pdf
    • http://files.bcarterartanddesign.com/uploads/1/3/0/8/130874598/6453349.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/56041428036.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/lekitumibonokug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/vumofofurizonifugiporu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/41854904615.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/70125348334.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/96714223388.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/dulugorofakuzunadorat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/xinolusejat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/22204916322.pdf
    • https://cdn.shopify.com/s/files/1/0434/1861/5975/files/elf_bowling_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/pilajiluked.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/69889803840.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_off000061ef.bin
6c58f933f0909e9eb636206d41da7a72b2da8da23dfce06632c8c99a709bfcba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5100 bytes
font_01_sfnt_off0000734c.bin
e8525d421ac18629f03e2a7125b44107785090beeab1940d3c68741538d0bfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 15244 bytes

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