Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c8791f9891e467…

MALICIOUS

PDF

43.1 KB Created: 2020-08-17 14:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c48a9d1c6ece90bf0e88829842bac8c SHA-1: b8d3a234b4d4aaec8abcd8e43ef5f6b40472388d SHA-256: 61c8791f9891e467890a86dadfed7cc89d071052995fbe6038dbce4acc215962
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One of the primary links redirects to a malicious domain, indicating a redirection attack. The document body, though partially corrupted, contains the phrase 'Business intelligence definition pdf', suggesting a lure to disguise the 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=business+intelligence+definition+pdf
    • http://files.cpeessentials.com/uploads/1/3/0/7/130740252/37dda7cbc.pdf
    • http://files.zachrutledge.com/uploads/1/3/1/4/131453448/topunileji.pdf
    • http://files.heightshightigers1988.com/uploads/1/3/1/4/131437333/fepimevekewan.pdf
    • http://files.coloradopricklypawshedgehogs.com/uploads/1/3/1/4/131437832/notusokanufizoj_kedek_nusad.pdf
    • http://files.jenningssheffield.com/uploads/1/3/1/3/131384605/9347059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/fexajadumirotogidupodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0433/4767/3253/files/statistical_quality_control_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0443/0161/5260/files/sky_movies_bollywood_2014.pdf
    • https://cdn.shopify.com/s/files/1/0432/8013/8398/files/rune_list_diablo_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/fine_boring_machine.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/best_self_introduction_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/nurokagaxudipumul.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/adjectives_worksheets_for_grade_8_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/50898856354.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/28580462707.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/96209893746.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_off00006c37.bin
fb61751767456fc4b9b71aadb837403538157e7931369a3c64847519f5921d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 5064 bytes
font_01_sfnt_off00007d8a.bin
afb9aed8946f3f9d0978df40fa6dca079058832081a812f66bec292bb9a39c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8A 9904 bytes

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