Malicious PDF — malware analysis report

Static analysis result for SHA-256 93611a6b45e8eed7…

MALICIOUS

PDF

39.9 KB Created: 2020-09-05 16:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 851022b6682577aba113ae8b52dad93f SHA-1: 9c3a1248085f9ee5ea157189b56af75bdc52a829 SHA-256: 93611a6b45e8eed722f28e440cfd4b1204bfe38a6e99d1dc099cc20922e31817
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malware. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, suggesting a lure to trick users into clicking the link. The presence of numerous PDF links, many pointing to Shopify, suggests a link farm used to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=oxford+dictionary+for+android+offline 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/1/0430/6717/9162/files/rexep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2585/6662/files/topographic_map_reading_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8495/6057/files/31391913051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/java_8_lambdas_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/7269/6999/files/greenhouse_effect_seminar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/nuzub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/calcul_d_un_arc_de_cercle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0032/2458/files/couper_adobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/28070840561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8937/1044/files/vexatogikebuwumebiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/xobopanaxoweketiget.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_off00005ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBE 5036 bytes
SHA-256: f31eb1daf34f62640e830b94262b12e0a661370dfddddf290aeccf8af24f22ed
font_01_sfnt_off00006ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 10452 bytes
SHA-256: 7c7b211a2b980d8173e157f56fc14898680290369acadc63bf82880fb7c8448a

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