Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd1dc44a2102342…

MALICIOUS

PDF

46.6 KB Created: 2020-09-13 04:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a13d80f15bb21dff5270eccaeec2de0 SHA-1: 728824b5b2bf4fbd50532397793a77b5788f0447 SHA-256: fbd1dc44a21023420ed5cbdd8d4b850c11d9e48912aad7a10ed4c2bb7d2eaf91
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The embedded URL 'https://ttraff.me/wix?keyword=phenolphthalein+alkalinity+as+caco3' is the primary indicator of malicious intent. Additionally, the PDF hosts a link farm of 15 external PDF documents, suggesting an attempt to manipulate search engine results or distribute content through a large number of benign-looking files. No scripts were extracted from this sample.

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=phenolphthalein+alkalinity+as+caco3
    • https://static.usrfiles.com/ugd/0af078_7e06613cc7304ec8b7830bed3c74beb4.pdf
    • https://static.usrfiles.com/ugd/a43ec6_a193757d81c64052b475e53682f4969e.pdf
    • https://static.usrfiles.com/ugd/b8c837_02d3e4587d254423a7fbd95ea432ab12.pdf
    • https://static.usrfiles.com/ugd/01e791_c7517918997d43d7af34dd0e3c3024e3.pdf
    • https://static.usrfiles.com/ugd/bfd504_938e4750542b4e579dc3c56bb845c041.pdf
    • https://static.usrfiles.com/ugd/18574e_6b9d097a863248e683a3f00c3c4037e3.pdf
    • https://static.usrfiles.com/ugd/98857b_9ca88cc977c644108acadc583257eb37.pdf
    • https://static.usrfiles.com/ugd/61f964_28e692ebba5f43799f7719c648623df3.pdf
    • https://static.usrfiles.com/ugd/2ac701_cf398d87fafd437cba882674834b6a77.pdf
    • https://static.usrfiles.com/ugd/d51d36_1fee1306523840149b8e56df65a83a9e.pdf
    • https://static.usrfiles.com/ugd/e745be_73455f837068409fa26ec8f2ba7c8d9a.pdf
    • https://static.usrfiles.com/ugd/536122_50ac908b1c924ced9b27f57f0af4e691.pdf
    • https://cdn.shopify.com/s/files/1/0439/8913/9614/files/90722967415.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/chemistry_formulas_in_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0773/5969/files/gradle_test_report_empty.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_off00007750.bin
16e5dea9eeab2d00b90af7c7cb8e8c65370aeef5797b86818c312841fec5dfdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7750 5256 bytes
font_01_sfnt_off0000893a.bin
7affc3b493e6d91cc31f59b7b748110bc57c5f6880eb919b14f8db25ae031503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893A 10532 bytes

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