Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eb9c37e189bb22…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 12:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0704d40832fb240a0902c4e0eda75926 SHA-1: 4bbf5db42da48748cb6f2f8290c4ae7d3700bb01 SHA-256: 90eb9c37e189bb22dccbc5ca04223795d015409c3cab111f98235edb39fb033a
150 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, pointing to 'https://ttraff.club/wix?keyword=addition+color+worksheets+for+second+grade'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly flags this PDF as malicious. The document body, though partially corrupted, contains the same malicious URL, reinforcing the lure of educational content to mask malicious 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.club/wix?keyword=addition+color+worksheets+for+second+grade
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/muwezepigeji.pdf
    • https://cdn.shopify.com/s/files/1/0434/7422/3269/files/lixopinimin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4307/files/wipovekejatewe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/wominukareketeri.pdf
    • https://cdn.shopify.com/s/files/1/0435/4870/4920/files/24268984201.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28391359898.pdf
    • https://static.usrfiles.com/ugd/c068f8_2424dc064dfa4bf99f8a6ccda74a0d2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_337eaea437404630ab88b982952dc62e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9c5191d22f84a9d969b58805b3a69d4.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_c5c8242e40454c7f82ea8cb5f28c8174.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_off00005f56.bin
209f72fd283e934b2184b0090d7f4bcaf2a2ad3fff9c5844313390c790e6ae89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 5428 bytes
font_01_sfnt_off000071dd.bin
d9561e8ef772f6f0ac681477d9d0e4e4272d9181b828437c6758976fe2d52032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DD 10364 bytes

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