Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcc54130ffdf0d1…

MALICIOUS

PDF

46.8 KB Created: 2020-07-26 09:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa5e6f2425e23da097a4ab6c8250e475 SHA-1: 5dc9c671fb197f3c766c333fc3c41aefc391a7d2 SHA-256: 7fcc54130ffdf0d106d73ae26de706d4ef1589dbbae04e1258f7aa06896dd17a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm designed to redirect users to malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'accepting invitation email template'. The primary malicious IOC is the redirector URL, which is likely the first step in a multi-stage attack.

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.com/pify?keyword=accepting+invitation+email+template
    • http://files.heatherlynngilstrap.com/uploads/1/3/1/4/131452935/5132197.pdf
    • http://files.4140designs.com/uploads/1/3/1/8/131856247/6245024.pdf
    • http://files.musicalfuturesdlownloads.org/uploads/1/3/1/4/131453068/bibodos.pdf
    • http://files.info-integratedtherapysolutions.net/uploads/1/3/1/3/131398145/4b82b34afe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/zogowikepokobem.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/gibamitagunipowuvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/kunipaladeferarusebites.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/76332226870.pdf
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/gituwexesiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1395/files/rejokedijunebodajiwot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3071/files/81980269485.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/sudeloxateriruxekivejapi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/52709086067.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/70917011477.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6390/files/bipiwe.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_off00007ba0.bin
a84b1d070b9f8b47d2c3f1fb3b4d507e0b2d48decf975c9e652461f435e754e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA0 4816 bytes
font_01_sfnt_off00008be5.bin
d00fc492e596e70fcf3615a34ac5a6bd4735c0a58aa55a626624074ee22f5e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE5 10044 bytes

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