Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b6f147938bd71a…

MALICIOUS

PDF

46.3 KB Created: 2020-08-29 22:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ae177707a0fb420acc7d26d3e0723c6 SHA-1: 996c4bd2396c19f1748edff58cd5f39e869f39cf SHA-256: 08b6f147938bd71ad00cbc274fdc0dc5d8754ad3875c0cee1cd0fafef90d8666
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, disguised as a vocabulary exercise. This indicates a phishing or malware distribution attempt. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=vocabulary+exercises+for+pre-intermediate+students+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/convert_list_to_dataframe_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/1908/3677/files/tiwagureb.pdf
    • https://cdn.shopify.com/s/files/1/0447/9421/6599/files/wysiwyg_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/dirakopipozotera.pdf
    • https://static.usrfiles.com/ugd/b8c837_36c6dc174ab740968a63cd7562d895ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a39a7ce759e4f0db767721530deed90.pdf
    • https://static.usrfiles.com/ugd/b8c837_953e6decbe2a445cbfe6efe51b00db57.pdf
    • https://cdn.shopify.com/s/files/1/0435/5362/0136/files/megarosalokijij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/bookmark_in_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/anatomie_physiologie_du_coeur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8514/files/24846970323.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4449/files/google_sync_outlook.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/50315587652.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_off00005fbc.bin
1aad3e6208b269ba66951003188c46a246269b1ea4eb320932789abdfe5c1978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 5608 bytes
font_01_sfnt_off000072ba.bin
3d4c5d351447f4f66562fcf6e6ac034d8c157cbc0f611d251db26ee9b2d7333f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 10588 bytes
font_02_sfnt_off000096dd.bin
64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DD 16116 bytes

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