Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1f0c36bfeb343b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-15 19:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b866434dfaa730ef4513e924c3a451 SHA-1: c56b7d6c17cafe629291cc8ea2c5d4db73d1c7d4 SHA-256: 6c1f0c36bfeb343bf6a3411b2402957aaf47de5e4fcae3ccb00ea8733f6c75c1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'timken deep groove ball bearing catalog pdf' and the malicious URL, suggesting a lure to a site that likely hosts further malicious content or phishing pages. The ML classifier 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/wb?keyword=timken%20deep%20groove%20ball%20bearing%20catalog%20pdf
    • http://gofavuz.beattheoddspsg.org/uploads/1/3/1/3/131379578/2802474.pdf
    • http://suveb.junipershorepublications.com/uploads/1/3/1/3/131383363/pufewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/gumabafaxonododamurawob.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/gidor.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/folufexuvuvonedoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/perexus.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7308/files/jepel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/73413475753.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/ecological_relationships.pdf
    • https://cdn.shopify.com/s/files/1/0431/2583/3884/files/pofozaza.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/vepomuvobezudisis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/kaguz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/tratamiento_para_la_anorexia_y_bulimia.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_off00005296.bin
854d2994cde2824750b3989c1ec5ce8e1ccb16b1243fd2a6f22f4518642499fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5296 5512 bytes
font_01_sfnt_off0000653e.bin
c5bb292360cdd5b7f6754297aa2c58d872d710f5cb15f7418bdbf051adc644a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x653E 10116 bytes