Malicious PDF — malware analysis report

Static analysis result for SHA-256 151d59362eb441cf…

MALICIOUS

PDF

43.9 KB Created: 2020-09-08 09:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6b8318f1dc03285a775a7f321dc443 SHA-1: d5fc90e14fafac945c5a29f9db2f1b3f4a8c30cf SHA-256: 151d59362eb441cf887500c0db65440cda369f9c608872a2d4f770fd6c9a5f4b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.me'. The document body, though heavily obfuscated, contains the same URL and references a 'worksheet', suggesting a lure. The presence of numerous external PDF links, many pointing to benign content, indicates a potential link farm or SEO manipulation tactic to disguise the malicious redirector. No scripts were extracted, but the malicious URL is the primary indicator of compromise.

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.me/wix?keyword=area+of+triangle+using+trig+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/930050_502686f7bf22498890fae06b6d5cf990.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_f82abe27bc9d43fb86ffb42cbcf84495.pdf
    • https://static.usrfiles.com/ugd/7603ae_9c3e271d3c5c45b3b8d0f866b07a7aea.pdf
    • https://static.usrfiles.com/ugd/b98abb_bfafcd0c890744faa80e2f9e34560e36.pdf
    • https://static.usrfiles.com/ugd/1be480_692243a7f7c94a658ad6ee44abfb5a10.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9321/files/antebellum_era_reform_movements.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/sufakuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/bpsc_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/48195394045.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://static.usrfiles.com/ugd/6cf392_1cbc6995eee34121a87e7a0e37d2542f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058bb.bin
dac3205050a25cd8f83f3370d4a568c7050b745b85ecbd7bf5131ddd984acf1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BB 5172 bytes
font_01_sfnt_off00006a64.bin
7362cac61cf4ee2b3664e12c40fff683ed71b7a2ec0e4feb9747910cbd2d7753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 10280 bytes
font_02_sfnt_off00008d7b.bin
7014607959372ab4ed7ceda1eeb5aa45e483833ac87e0aabdaca4b83aad9ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7B 16244 bytes

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