Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f71e6d84bf60e95…

MALICIOUS

PDF

48.4 KB Created: 2020-08-07 09:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a81452463d2ad396ecf5c69283db624 SHA-1: 64db7f36b8c6ff4676aabfedd4ab8baf75a62b52 SHA-256: 5f71e6d84bf60e9533bc686053a38c4d0463673e1fa06ca215e83b62de72e808
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to lure users to malicious sites. The primary malicious URL identified is https://ttraff.com/pify?keyword=a+flowering+tree+summary+pdf, which likely serves as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=a+flowering+tree+summary+pdf
    • http://files.glowwellnesscollective.org/uploads/1/3/1/8/131857112/eeb9520f6b1.pdf
    • http://files.rhinotruckparts.co.uk/uploads/1/3/0/8/130814510/bedulemijisonepos.pdf
    • http://midevevi.sunnydawngrooming.com/uploads/1/3/0/8/130814238/18823.pdf
    • http://files.jacksonpaintinginc.com/uploads/1/3/1/4/131453302/74e0588d0bd387c.pdf
    • http://files.nudnikdesign.com/uploads/1/3/1/4/131438418/841a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/guxarapugumewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/23899415113.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/13505035357.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/79569255157.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/vocabulary_building_with_antonyms_synonyms_homophones_and_homographs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74098669839.pdf
    • https://cdn.shopify.com/s/files/1/0436/5467/6645/files/gifuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/install_part_rh_20141.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7918/files/45226042169.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b17.bin
14293394d6fa3f89e9f1f71ea14c03acafe0431be29aec4ed967eec8de896f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 5544 bytes
font_01_sfnt_off00008e03.bin
df6e6f9e7ae95df1f3974b0cc77489449aab0eb29f5defef62b2a645b7159adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E03 11376 bytes

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