Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bc9eb018c21dbc…

MALICIOUS

PDF

44.8 KB Created: 2020-08-29 12:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de52229450a43c0021e914c961fe93f1 SHA-1: f7e54e8a07195d2ec1dcbd7b5793066eaf500fc9 SHA-256: 94bc9eb018c21dbc59d0778c6cb0e8f785e77da19d9d4d159de1cff362866aa5
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru', which is used in conjunction with a keyword search term suggesting a lure for financial or investment-related content. The document body, though heavily obfuscated, contains the same URL and keyword. The presence of a large number of external PDF links, many hosted on 'cdn.shopify.com', suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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.ru/wix?keyword=tax+lien+investment+bible+pdf
    • https://static.usrfiles.com/ugd/b8c837_3bc19c4b22e94fb09da987312d9a7df4.pdf
    • https://static.usrfiles.com/ugd/b8c837_713cf3315c39486a8fafe1f340c7bd80.pdf
    • https://static.usrfiles.com/ugd/b8c837_356230d3c3694ca8af539d8cba9a1ce1.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa9edf5b06d34eaa87515a65ae1775fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7d1e08b2b22426390614c8d885f4e7b.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/bioecological_model_of_human_development.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/va_form_21-_0538.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/magento_2_install_theme_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/77002018800.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44329390643.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/les_4_accords_toltques_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6264/files/57361484545.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/sopujuzeziwixawinekaku.pdf
    • https://static.usrfiles.com/ugd/b8c837_337896b70c954961bb4fec53f7b53413.pdf
    • https://static.usrfiles.com/ugd/b8c837_f369167a16424859b507f67f9304f693.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_off0000702e.bin
25293ca5c10bbf3f109d5890c238f5b0720bdc66beb1363b0a15545afc448c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702E 5308 bytes
font_01_sfnt_off00008234.bin
4c74aaf40e72d15e4fcdd00c1cb689afc9154662ec19438f532c685046fedbd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8234 10792 bytes

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