Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc21cbf0b3c2bc…

MALICIOUS

PDF

56.1 KB Created: 2020-07-30 07:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcc5b42febab5910579f36f724c69e84 SHA-1: e8ee62ab4c12950ef2efe15ef2345f4e010e3912 SHA-256: 6acc21cbf0b3c2bca70e786831cedbc31a4d977721f1dcfa1f7b220dcab9d7ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.com/pify?keyword=questoes+analise+combinatoria+enem+pdf', is a known malicious redirector. The document's purpose appears to be to drive traffic to malicious infrastructure through these embedded links.

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=questoes+analise+combinatoria+enem+pdf
    • http://files.lifeindustries.org/uploads/1/3/1/4/131437376/zikubijob.pdf
    • http://files.cafe52nerima.com/uploads/1/3/1/3/131378943/fikiwedelifipot_nivibuxeviw_falosure.pdf
    • http://files.soyouthinkyoucancatfish.com/uploads/1/3/2/6/132681307/ratilugorore-matoriwixa-podos-kirenovapatadaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/54963802525.pdf
    • https://cdn.shopify.com/s/files/1/0433/7949/0968/files/wojobarunafuzi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/dukevasowelebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/pumijigugixulakovoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/73332285314.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/97703120441.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/15082571961.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/rikasudofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/67343539034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/daguv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/21176544173.pdf
    • https://cdn.shopify.com/s/files/1/0432/6277/1358/files/4036023329.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/96507374788.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/tilamojexovenev.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_off00009e4f.bin
27d0fc921608545ae36c7abf8becc49c1dba3475df783034481b94a332b84c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E4F 5384 bytes
font_01_sfnt_off0000b071.bin
f889be2480ac90f164e38aa031bd231b8719570f7b81fd4151398b61da96682f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 9976 bytes

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