Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ee5f16b50a71ab…

MALICIOUS

PDF

43.4 KB Created: 2020-08-11 19:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deccdf62fdba5805a8cbe51e34e09740 SHA-1: d190d8c2d74db0efc5e8544a9604cb8771634785 SHA-256: 36ee5f16b50a71abf65516bfdbbaa28e12164e5833064a99cb6dd1ec6e353596
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.com/wb?keyword=hansgrohe%20talis%20s2%20manual', points to known malicious redirector infrastructure. The document body, though partially corrupted, also contains this URL and references to 'wkhtmltopdf', suggesting it was generated programmatically to host these links. The primary attack pattern involves luring users to malicious sites via these links.

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=hansgrohe%20talis%20s2%20manual
    • http://botufa.saipanprivateschool.com/uploads/1/3/0/7/130775164/nunifavumusojakubok.pdf
    • http://files.recconnectionmiami.com/uploads/1/3/1/4/131482931/rukasunurej.pdf
    • http://files.backyardheavens.com/uploads/1/3/1/4/131453068/samokikiranuduro.pdf
    • http://files.bhameconsoc.com/uploads/1/3/1/6/131606011/sojovusaderad.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/vurozawumuludedoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56317886700.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/39307281432.pdf
    • https://cdn.shopify.com/s/files/1/0434/8159/6066/files/71206123106.pdf
    • https://cdn.shopify.com/s/files/1/0431/3094/5693/files/kuzobitukina.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/59241766233.pdf
    • https://cdn.shopify.com/s/files/1/0437/4151/1834/files/giziza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/73843233945.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/alfabeto_em_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/43174698694.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/93487550817.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.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_off00006d18.bin
2af08dc00708611c01ec324c2e4cecd2ae3095935fd8f57d9656b3810073d742
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D18 5192 bytes
font_01_sfnt_off00007e8d.bin
0821d4222db9134a9bda68fcee71d9302be65f6bcaab41f36b1edb7268a52116
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8D 10080 bytes