Malicious PDF — malware analysis report

Static analysis result for SHA-256 11940fa241815995…

MALICIOUS

PDF

45.6 KB Created: 2020-07-30 07:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7af95164d57654c5da989fe23382ddd SHA-1: 872dd90f3ed5330114e09d761561d760017fbb99 SHA-256: 11940fa241815995fd2d26ac9236cfec417e6f16fe64807145888d0f5d5125df
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/pify?keyword=agostinho+de+hipona+confiss%25C3%25B5es+pdf
    • http://files.teachermrbenson.com/uploads/1/3/0/9/130969683/fuzixetawomuguwilefu.pdf
    • http://files.denicechenault.com/uploads/1/3/1/6/131606670/rasugupelod_falilugi.pdf
    • http://files.clairelucasgallery.co.uk/uploads/1/3/0/7/130738876/ronasari-xelavevogavoguw-mivuro-duxosuzaj.pdf
    • http://files.solanophonerepair.com/uploads/1/3/1/4/131452883/11fb1dad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4031/7335/files/povizosatisurevad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/34531196998.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/totebinikujidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/kaxazekujula.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/24700265181.pdf
    • https://cdn.shopify.com/s/files/1/0436/9829/0856/files/lalisodarer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9380/3679/files/pomomobizowawobuwenir.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/14531985053.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/64417377433.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/84058373296.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_off0000710c.bin
3ee3ce32d2fc076debed3b2c595ee1f7cd4972169dc8ba4b7442c4c4b5d1e6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710C 5284 bytes
font_01_sfnt_off000082c1.bin
141d7b71fc53a4089466660fb92b1c08d8a00ffb82278a0c0839bb0afc69e9b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 12292 bytes

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