Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3ebc9181fd67d8…

MALICIOUS

PDF

35.2 KB Created: 2020-08-24 21:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c62819886f8c997acb1c3d27679f664 SHA-1: f5b2e32b8332b88a9b175cdd35c5003c19a47af9 SHA-256: 3a3ebc9181fd67d8f944d65f62bed690d04f9a4ca12c3e0aa60dc001e9afadac
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=subjunctive+mood+worksheet+pdf', is designed to redirect users to malicious infrastructure. The document also contains a large number of embedded links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or distributing malicious content. No scripts were extracted, but the presence of the redirector and link farm strongly suggests a phishing or social engineering attack.

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=subjunctive+mood+worksheet+pdf
    • http://suruvex.mobilecarandrvdetail.com/uploads/1/3/2/8/132816202/9aad649bf.pdf
    • http://files.bbhames.com/uploads/1/3/0/8/130874676/7541741.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/29419351888.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/999029316.pdf
    • https://cdn.shopify.com/s/files/1/0451/8959/5287/files/basis_bilangan_bulat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38664456414.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/towufurefetetak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/cg_scert_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/pibabazoniwobawapubililiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/pearson_ib_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/20563227520.pdf
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/darewapizaxofasopulifono.pdf
    • https://cdn.shopify.com/s/files/1/0430/7520/7322/files/rumidatasosusabizun.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_off00004b0a.bin
9c1cbba924fdfcd35ae4bcd604beafc8ded15e1808879d87bf00d8d7e00f9787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B0A 5688 bytes
font_01_sfnt_off00005e54.bin
c8dec115ffd62c8413bdfe7ee057fb570fe81b1281daa297f97838b378deb22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 9920 bytes

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