Malicious PDF — malware analysis report

Static analysis result for SHA-256 861841ee4d453cc2…

MALICIOUS

PDF

49.2 KB Created: 2020-07-30 09:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a358f6f449cd6b946b5a64dbe238768d SHA-1: 81f30b747879bc7641319c79d08a7856cbc6e9a5 SHA-256: 861841ee4d453cc2a5ec1fb3595cdaa3e67922340987029dce496fd1dc612475
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.ru/pify?keyword=byomkesh+bakshi+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its content, but the presence of numerous external links points towards a malicious redirection scheme.

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=byomkesh+bakshi+pdf
    • http://files.mashamsteamrally.com/uploads/1/3/1/4/131437750/vifigagugexafena.pdf
    • http://files.emmaharry.com/uploads/1/3/1/6/131606121/14ea0e08976f.pdf
    • http://files.junglekitchen.com/uploads/1/3/2/6/132682119/tuzosusirijovi_raziwo.pdf
    • http://files.redneckfest.org/uploads/1/3/1/8/131871692/funubofugu.pdf
    • http://files.emmaharry.com/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/73713426186.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/81650120361.pdf
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/17885772141.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/wigum.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/xexidevigamaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/59554831347.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/wagogejevorekotozabugiva.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/felilafadojixoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9368/0547/files/rexekagaximozixavidanifu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/50374984179.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/13563781370.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/gatamanosak.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_off000079ad.bin
192e331f406e5ebe222b282aee28de9dea5b5cc4c7dd8752232c95f2288586f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AD 5112 bytes
font_01_sfnt_off00008b1b.bin
58139e999590228e3ec3e792d1bb4e72d507b2a1c6a67040f33a513ad3ebc1ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1B 14400 bytes

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