Malicious PDF — malware analysis report

Static analysis result for SHA-256 11981db9d5886540…

MALICIOUS

PDF

42.5 KB Created: 2020-08-15 14:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f8fd121cf89b807192d0725005f449c SHA-1: da338dbc51f51c9eeddbfb349b56d106402f5455 SHA-256: 11981db9d5886540aaa3e9ac061a1e5470b689125eed7120c43282372c028518
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically advertising 'Nitro PDF full free'. The primary malicious URL identified is https://ttraff.cc/wb?keyword=nitro%20pdf%20full%20free, which is flagged as a malicious redirector. The document body itself is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing or scam attempt.

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/wb?keyword=nitro%20pdf%20full%20free
    • http://files.stmarymagdalenewpg.org/uploads/1/3/1/8/131856531/badifa.pdf
    • http://files.teresacarosa.com/uploads/1/3/0/8/130814254/8407900.pdf
    • http://files.canadianrivervalleyrevenge.com/uploads/1/3/0/7/130740443/5608059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7337/9230/files/xekug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/7167656441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/hydraulic_bending_machine_project.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1557/files/birthday_girl_murakami_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/47252016137.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/kokuxosotabinuzuzibored.pdf
    • https://cdn.shopify.com/s/files/1/0434/9660/3814/files/losofuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/42679881428.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/26039261690.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/bronchiolitis_guideline_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0448/4156/6370/files/asthma_action_plan_rch.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/qualitative_systematic_review.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/27305602884.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006370.bin
d73178cc1d68f2ebc59d4c65de2e2a2e37d934e9b201a2dfa7f21affd5cc1da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6370 4616 bytes
font_01_sfnt_off00007333.bin
4e996fa48ac541ca90c613322432e88ac3d0650a90b12b52c50f5ab95b6b9e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7333 13092 bytes

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