Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ea0a90f3fdb69b…

MALICIOUS

PDF

35.2 KB Created: 2020-08-30 21:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9e3bdbdc0b6174e12b0074c3e63eda6 SHA-1: 2c2dbae28235d1ada88ae3e0ec37d5ae38554a2f SHA-256: 43ea0a90f3fdb69bcd4f74a7f97e6f0f3e1fbc4a18ff89e03f10d7e1f34e2525
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm of 16 external PDF links, with the primary malicious redirector URL being https://ttraff.ru/wix?keyword=enco+bandsaw+parts. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a SEO poisoning or link farm attack designed to drive traffic to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated.

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/wix?keyword=enco+bandsaw+parts
    • https://cdn.shopify.com/s/files/1/0450/3319/3622/files/epitaph_king_crimson_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/92150406500.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1406/files/strategic_management_ppt_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/11158840920.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/81369753372.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/access_control_policy.pdf
    • https://cdn.shopify.com/s/files/1/0453/3600/2715/files/44468402081.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a1bec67214c41a7b49445864f8a60dd.pdf
    • https://static.usrfiles.com/ugd/ca300b_6eacea8b70e3427c8997fea2b3326c7e.pdf
    • https://static.usrfiles.com/ugd/ea2f88_2dbee35f702c44b5bdfcb8505d27c5cb.pdf
    • https://static.usrfiles.com/ugd/8e1900_03e176d19b4c47cbbae741876bb86863.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/77498961670.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7189/files/kadulujeduvozogugapuwov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/toretokadumiwefabefeta.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3462/files/varicocelectomia_tecnica_quirurgica.pdf
    • https://cdn.shopify.com/s/files/1/0440/9019/6133/files/mugumu.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_off00004afe.bin
76d991089977a8bf6aec5d97799ff9b516152be7599605bc9ead38b63ddaec73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFE 5224 bytes
font_01_sfnt_off00005cd7.bin
0e203fc448918ec95622e06e966b604e28204c2d44efa377b8f2029e5529d177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD7 10372 bytes

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