Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d66d65573991647…

MALICIOUS

PDF

34.1 KB Created: 2020-08-19 17:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 32738eaca02256d9b0462b8bc7dd74ca SHA-1: 6a642514ac62b2c68cb95914f7caa6ddc220cac0 SHA-256: 7d66d6557399164783f545e6db7861b654eb5e279ff4cd8534ebf5a6353704e4
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 redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that also leads to this redirector. This suggests a campaign to drive traffic to malicious sites, likely for phishing or malware distribution.

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.cc/pify?keyword=academic+word+list+cambridge+pdf In PDF document text
    • http://godax.stlcreativecave.com/uploads/1/3/0/8/130814328/jisob.pdfIn PDF document text
    • http://files.brooksidechiropracticcare.com/uploads/1/3/1/1/131163736/woxareromapo_nuxaro.pdfIn PDF document text
    • http://madebolo.springdalesva.com/uploads/1/3/2/7/132740619/niwijifexalesa-zekawexog-zawevavagele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7591/0294/files/jorogup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/73604974324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8264/4642/files/bloomberg_new_energy_finance_bnef_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/add_readme_to_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6525/2769/files/59222181351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5768/4385/files/27901811772.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/amature_meaning_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9983/2995/files/gozezomivogariwotakudu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4933 5696 bytes
SHA-256: 4d765b25997f30158bc0b5dce18f986b4d05edd474eabcaea29189ba44db8f92
font_01_sfnt_off00005c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7E 9436 bytes
SHA-256: af30330dceb749fbd982d5a9df8f08a171a546a0ae85bbd145219ba41313a686

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