Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73c216eaa0bb120…

MALICIOUS

PDF

40.9 KB Created: 2020-08-18 22:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b51db5164de7bc8bd1fef5ec6dc59733 SHA-1: a3e99e40ffc8a4c6a22648dfbfcfa7b7327beb3a SHA-256: b73c216eaa0bb1206765a8b8de48b59722cc228d25eacae85a5e07458c2e4b2e
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links pointing to redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=rotational+symmetry+worksheets+grade+5, which is part of a link farm. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or malware delivery.

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=rotational+symmetry+worksheets+grade+5
    • http://files.rememberingourlovedones.org/uploads/1/3/0/8/130814208/gadimexazabulovire.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/50005733128.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/parent_teacher_conference_forms.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/kutadaxebozokufibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/33881414264.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/steam_boiler_technology.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/english_newspaper_word_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0437/8496/2199/files/cazadores_de_microbios_resumen_por_capitulos.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/kagitoba.pdf
    • https://cdn.shopify.com/s/files/1/0432/7453/5067/files/the_flash_mod_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/21669248160.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/91533656945.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_off00006106.bin
08de6717e73be539b24a1743159817dade6473483ed5b7d973ee5d697a670866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 5628 bytes
font_01_sfnt_off0000741e.bin
16c82b4c3acdb4db7e4e9efc3e098cc88b35279077ae3ef35c2cd005b5dd37ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741E 10232 bytes

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