Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b31ef16b0884816…

MALICIOUS

PDF

109.6 KB Created: 2020-08-05 05:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c7edad10467a20743e946ce8e86c7f1 SHA-1: f9b031febf1e32faef4a5acd1a62554003c2e55a SHA-256: 7b31ef16b0884816eff86679ca58dfdfae660e1db2e79a0365d9464e7b8e36b0
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wb?keyword=the%20613%20mitzvot%20pdf', which is the primary indicator of malicious intent. The presence of numerous embedded PDF links also suggests a link farm or redirection strategy.

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=the%20613%20mitzvot%20pdf
    • http://files.martharinger.com/uploads/1/3/1/4/131438474/5918897.pdf
    • http://files.jennifercarrpainting.com/uploads/1/3/1/3/131380005/nekulujasoseb_pogijisetapoj_givimudofil.pdf
    • http://files.tara-sarahna.com/uploads/1/3/1/8/131857114/11bb05e81d.pdf
    • http://files.gracecommunitycarshow.com/uploads/1/3/2/6/132681969/boditepazam-vedixanexe-kivaxot-niropu.pdf
    • http://files.reyal.co.uk/uploads/1/3/1/6/131636954/4960771.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/73936540189.pdf
    • https://cdn.shopify.com/s/files/1/0437/2037/6474/files/56376153673.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/deliberate_risk_assessment_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/realtek_network_drivers_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/histologia_del_pancreas_endocrino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0430/1130/9719/files/bidozazit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/8028389218.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/51691506143.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_off00016add.bin
b65add9a9d26c2cef659f05bfa4d342b69109bbadcbad41ce91cd1f96a787392
pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADD 5196 bytes
font_01_sfnt_off00017c84.bin
ef0dbaee89e71e02e69060c3e63bbec0eaf1049a842cd5234a53bb67dd88b951
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C84 13620 bytes