Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc78d183df762b74…

MALICIOUS

PDF

40.7 KB Created: 2020-07-31 22:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05fa33cc59066f9c9567523a79ca8dc SHA-1: 0da70dc28f52451fee999be32a3aa67afc19482c SHA-256: fc78d183df762b74f438fa456394eddad967d0c83cfe04fa7027a16dcabc4eaa
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/pify. The document body, though heavily obfuscated, contains references to 'acls provider manual 2016 pdf' and the malicious redirector URL, suggesting a lure to trick users into downloading further malicious 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.cc/pify?keyword=acls+provider+manual+2016+pdf
    • http://files.stefanodenicolai.net/uploads/1/3/2/7/132712514/c741f.pdf
    • http://files.brownchurchmovement.org/uploads/1/3/1/1/131163599/lufukitin-wabepibisulimo.pdf
    • http://files.rachelsarasafer.com/uploads/1/3/0/9/130969241/lekadex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/37245930997.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1658/files/mexufudamabezalibido.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/18739140290.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/24591748607.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/tirupofewololabawubironaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/95609951991.pdf
    • https://cdn.shopify.com/s/files/1/0432/4350/3783/files/kawalimemokanibaluvo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/63583204612.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/26854020763.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/55837171971.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/wabajalexib.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/79481915973.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_off00005ed6.bin
7a027ebf14505904803fb260f1bc40c6cec1562fdc74961836b31d30e340b270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 5832 bytes
font_01_sfnt_off000072ab.bin
10182793368c8a5e676d63926633c61e478dd8056ee1f8ea5e15fa68534bf97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AB 10528 bytes

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