Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5a39461937cd74…

MALICIOUS

PDF

52.1 KB Created: 2020-08-05 00:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f1a38922ac81011fd3705ce2e7b962 SHA-1: 394bfbfc82ffbb7a1f1f1adda37e3c61e4c2e751 SHA-256: 0c5a39461937cd744b3dbee6a4cc84e18288631bcab6fe5f5b7d024c9922c587
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL related to a job vacancy. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm designed to attract traffic. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection 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.com/pify?keyword=ssc+stenographer+2020+vacancy+pdf
    • http://files.stmaryscountygardenclub.com/uploads/1/3/0/7/130739070/kanixumogizedusoj.pdf
    • http://files.faithbaptiststacy.org/uploads/1/3/1/4/131438676/2400428.pdf
    • http://files.tikicab.com/uploads/1/3/0/9/130968933/8194e8aaa285d.pdf
    • http://files.coldstreamsweetsandtreats.com/uploads/1/3/1/4/131407164/xobalipazedim_bugojito_mupujowoxor_kosomamaregibut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/26283199277.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17810153535.pdf
    • https://cdn.shopify.com/s/files/1/0440/0922/6398/files/55997274212.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/53945251448.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/cbse_class_2_maths_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0451/1078/8261/files/bestiary_7_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/65613478609.pdf
    • https://cdn.shopify.com/s/files/1/0435/7101/9935/files/garidevelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/envision_math_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/nike_build_smite.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/robivaxibefabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/nuxekejodupumilexiro.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_off00008bb3.bin
3f3ff8e7123120156eb12a5e6f3e62a7ccdd0f5adbf8f4b334bc083f82ce6e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 5924 bytes
font_01_sfnt_off00009fec.bin
f05ceadc1242293d786d626beb3f7c000e33d8b29dff19d104f40883077f2b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FEC 10312 bytes

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