Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d6c3a3510151c5…

MALICIOUS

PDF

40.9 KB Created: 2020-09-02 15:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: df5ce203f704b9cd1584c8d30caa8fc8 SHA-1: 66fc62792c518def033b53b4cfa3e6552c107150 SHA-256: b9d6c3a3510151c57b7cafc8cb3c58c5d58061a8c94bc3e5e818b0e63d94b2d7
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.club/pify?keyword=baby+birth+video++free' is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other benign-looking Shopify links, suggesting a lure to a malicious site.

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.club/pify?keyword=baby+birth+video++free In 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/1/0465/1204/6230/files/bohemian_rhapsody_guitar_solo_sheet_music_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/mathematics_definition_malayalam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/add_text_box_to_free_online.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2274a7_6394313a9cc948569e4cedb4c7cfe80f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_eb1910ab2eb4444caa65a964b73c9678.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8c0e65_e1cdb8c5d93344e9b039def45889f394.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/52b593_427b006e79c544779dfd3d26529040aa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/269bb8_371cb53e101641508e647db9bdd6ce2d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/pdf_booklet_printing_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/il_canzoniere_saba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9421/6599/files/swagger_api_editor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/xepekefezufufinuxinemuvip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8923/5861/files/java_7_32_bit_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4196/3679/files/suzepipatusu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630E 5136 bytes
SHA-256: 4c6f4addb7cf68b940e65116eb85f325dc79c39c8d552de40d2a0b4371d345ab
font_01_sfnt_off0000748e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748E 10120 bytes
SHA-256: 171f7f2b901e05c7979bf0adc521a4e8d20ce1e9b4446d129a5d72fe2eab1e63

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