Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b952a9be071d83…

MALICIOUS

PDF

43.2 KB Created: 2020-08-25 15:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c9bad09c3c5c5ac44363195e56d3b2a SHA-1: 37db796ad57084c2cd33e505040b2bc1a0363e9e SHA-256: 81b952a9be071d83188095fe7dce50f29a7e18ad254b67e3ef553cdc4cd0a0d7
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, a common tactic for SEO poisoning and redirecting users to malicious sites. One of the primary links directs to a known malicious redirector, ttraff.com, which likely serves as a gateway to 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.com/pify?keyword=analogies+list+pdf
    • http://files.loblakers2020.com/uploads/1/3/1/4/131438245/nejitiva-wegaw-bagowitop.pdf
    • http://files.flatlanderclimbing.com/uploads/1/3/0/7/130776158/mibokarekasama.pdf
    • http://files.honkrenaissance.net/uploads/1/3/1/0/131070520/3578f9490c503.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/rozuniwijifalonu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/bofutosetujad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/auto_click_golden_cookie.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/lexabinulelubijojebe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/always_on_display_android_8._0._0.pdf
    • https://cdn.shopify.com/s/files/1/0439/5863/2606/files/nostalgic_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/fogepapobelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/learn_excel_free.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_off00006d36.bin
4f5dddb1079a24b44dffe89a57b8022d0024a32d903e34231a05d15ee98cb3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D36 5100 bytes
font_01_sfnt_off00007ea9.bin
46e8ba8f0361b76d8f107ece7e381719c0e80b67315c256c6b63934000c74aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA9 10020 bytes

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