Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7360bccc5fb388…

MALICIOUS

PDF

38.0 KB Created: 2020-08-15 13:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3924a356c3600ede7855a0b4fd0b2b5 SHA-1: a38712b200af49904bb19602be80f61dc8b70731 SHA-256: cf7360bccc5fb388fbf988e904b5e163622327c344448b0a6812700d2d239172
150 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, a common technique for SEO poisoning and redirecting users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.ru/wb?keyword=dangling%20modifier%20worksheet as malicious. The ML classifier also strongly indicated maliciousness. The document body itself appears to be corrupted or obfuscated, but the presence of the malicious redirector URL is sufficient evidence of malicious intent.

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/wb?keyword=dangling%20modifier%20worksheet
    • http://deguvega.stjohnsepiscopalchurch.org/uploads/1/3/0/7/130776007/9359637.pdf
    • https://cdn.shopify.com/s/files/1/0434/8457/7958/files/human_body_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/mubijezeguwesipojim.pdf
    • https://cdn.shopify.com/s/files/1/0437/0189/5322/files/vajamonetukewes.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/72889768557.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/67321398352.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/english_words_with_meaning_and_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/pdf_editor_bookmarks_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/lazudodipax.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_off000056cf.bin
6c1a006772471b3d7eb6d1d543bc72df2a0bfce986f0b54b130e7e3cbdac3b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CF 5476 bytes
font_01_sfnt_off00006955.bin
4b9543c43f2f347f8f070070d6e6e4c26563472bb864e3912d4565477306d96e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6955 10060 bytes

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