Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cc726f132d8f06…

MALICIOUS

PDF

47.2 KB Created: 2020-08-22 19:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e9c7cfc540b619553a2e7e6acf82a0b SHA-1: 6488886d3e2e382b5b1476943d6cbb76ccdb3bfc SHA-256: e1cc726f132d8f062445349c29c9ab7ee99024722fc3691489d2e55e90251f56
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=oxford+dictionary+pronunciation+free'. This indicates an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes, likely phishing or malware delivery.

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.cc/pify?keyword=oxford+dictionary+pronunciation+free In PDF document text
    • http://files.sanmarcosmexicangrill.com/uploads/1/3/0/7/130775362/0a34f8536.pdfIn PDF document text
    • http://files.designetcinc.com/uploads/1/3/2/3/132302718/burobitebeso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/gubarukafitozuwade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/collaboration_diagram_for_hotel_management_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/30649598378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1032/5671/files/comcast_business_email_server_settings_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/cvc_words_printable_flash_cards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/laruruwoxopez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/wikezok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6666/1791/files/wabizigixuritiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/32855677281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8456/3110/files/21699773730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/cisco_packet_tracer_commands_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 5136 bytes
SHA-256: 866ee26c36a168b78e4b4f5a31428cad40f76c00504c9c2ef7a20aadf862ed50
font_01_sfnt_off00007545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7545 10576 bytes
SHA-256: cb417e2eb7590ec5540679834015532aacb556af8cb64d59191d0066d2ccce48
font_02_sfnt_off00009995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9995 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f

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