Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecb448ec4d7d83f…

MALICIOUS

PDF

45.0 KB Created: 2020-08-24 05:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c6f741f86102cfe2c11bb637f0dba8 SHA-1: 1151b016db50216242b92b73a41b153aa69b03dc SHA-256: 0ecb448ec4d7d83f34c217da86b03327b13f244dcbc8c9b4c152c18f0b99632f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as a download for Ubuntu desktop software. This suggests a phishing or social engineering attempt to redirect the user to malicious content. The ML classifier also strongly indicated maliciousness, supporting the presence of malicious 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.ru/pify?keyword=ubuntu+desktop+16.+04.+3+lts
    • http://files.americanwellnesssolutions.com/uploads/1/3/1/3/131382346/fasibas-zubigew-soxazefawad.pdf
    • http://files.mulvehillhomeinspections.com/uploads/1/3/0/7/130739991/151985.pdf
    • http://files.uscitizenshipprepcourse.com/uploads/1/3/0/8/130874493/kipet_gisolumokojo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/wusizimixizaveretoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6378/files/converter_to_editable_word_document.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/xetuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/parowetuwaxiniriri.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/gatazov.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6901/files/besabugobamokunagelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/bomigifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/sobetupuximi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/english_phonetic_symbols_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70913092576.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/72678596403.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/category_theory_for_computer_science.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625e.bin
89f102e3e0aeef6bbd8ddb87cf64a70695f16c0817fb088bf77872f6747f2e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 5308 bytes
font_01_sfnt_off0000748f.bin
b625a2ced374d2ba240553fafd62839157b6bf350c938ae3e5783530f6ba5b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748F 10672 bytes
font_02_sfnt_off000098ff.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98FF 4324 bytes

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