Malicious PDF — malware analysis report

Static analysis result for SHA-256 6197d86e17763621…

MALICIOUS

PDF

48.5 KB Created: 2020-08-21 08:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8024ae1aaaf2ff56ca60729acf548b8 SHA-1: ab4a88cfd3e286ea132033300bd64d8043214aa5 SHA-256: 6197d86e17763621613a22c1548f237275a7cbee38b6de245717eaa7406c491e
170 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to malicious redirector infrastructure and is part of a link farm, suggesting a phishing or malware distribution attempt. The document body, though obfuscated, contains text related to 'promissory note template' and includes the primary malicious URL, reinforcing the lure. No scripts were extracted, but the presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' flag strongly suggest a malicious intent to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=promissory+note+template+texas+free
    • http://wived.pocushub.com/uploads/1/3/0/8/130813834/6ec34e03807d.pdf
    • http://files.right-resources.org.uk/uploads/1/3/1/0/131071127/kapuzemutubav.pdf
    • http://files.custommask19.com/uploads/1/3/1/4/131407882/3424db21181a8aa.pdf
    • http://files.shottsbrassband.com/uploads/1/3/2/8/132816036/3208126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/maths_grade_12_functions_and_graphs.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/zunadogemumazoxig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8103/files/89286512441.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/enlaces_quimicos_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/refiwajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/tupuxanajusanadawatiworuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/curriculum_vitae_templates_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/2564/4192/files/93798404688.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/botijozulozorurobipo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/the_lexical_approach_michael_lewis_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/repaweg.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/country_code_81.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/kutaxoxemilinuwukike.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_off00007f12.bin
9a903f612cca08442b1d5c9e7eb951f27efafa875c2d3ab0edce066c3af083ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F12 5216 bytes
font_01_sfnt_off000090c1.bin
9f6eb1f5189e5970a361d31c7580349ba09b537906d65f4878a7fbdd0129b890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C1 10712 bytes

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