Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde5e285e22ccd45…

MALICIOUS

PDF

55.8 KB Created: 2020-08-01 05:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a84940fb9198a029772b6ff45affc3ff SHA-1: c9d12554f33daddf441922a509034c3fda58fdcb SHA-256: bde5e285e22ccd45e7e0c6a74c7fcb6436b55f7b3a7bddb169f5a74ad153f17f
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identifies a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=e6%2525+98%2525+a5%2525+e8%2525+8a%2525+82'. The ML classifier also strongly flagged this PDF as malicious. The presence of a large number of external links, many hosted on Shopify, suggests an attempt to obscure the true malicious destination and potentially leverage benign hosting for initial redirection.

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=e6%2525+98%2525+a5%2525+e8%2525+8a%2525+82
    • http://files.insurancewitht.com/uploads/1/3/0/7/130775732/nogetagufogogasajew.pdf
    • http://files.recoach.us/uploads/1/3/1/6/131637047/9277590.pdf
    • http://files.kosherhire.com/uploads/1/3/1/4/131454436/266828.pdf
    • http://files.carolineuahn.com/uploads/1/3/1/3/131381006/37313cff22a.pdf
    • http://files.recoach.us/upload
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/ruxotekar.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/65767412702.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0067/files/dorikuminisumen.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7046/files/mubiboxid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/kifawikagonipazewap.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/timepozumakunupesiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/54781419326.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/vonixepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/73820172357.pdf
    • https://cdn.shopify.com/s/files/1/0431/8248/9762/files/gedogaxafoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/desezexazujesatogev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ea8.bin
33bc9e3249b205214fb6079ec34bb0bc8333449304948dc279210a854cbac0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA8 5268 bytes
font_01_sfnt_off000080fb.bin
17c6ef8305f748b44219094d2a45bca97728dd0e1d45205da259677cc974d7bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FB 4768 bytes
font_02_sfnt_off000090f7.bin
8a04b099d2cff265ef1c0320c6de80f53aea40bc8e4aa6e8a7fe3d5c1a3b0c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F7 15552 bytes
font_03_sfnt_off0000c163.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 4324 bytes

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