Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf304049178f85…

MALICIOUS

PDF

59.3 KB Created: 2020-08-08 22:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 172fabddbe7f0928c89f2154a06b13c7 SHA-1: fcb9d77e5067bd77d648d1bfb75ca342b4e3be4f SHA-256: 5fcf304049178f854de931ff1fb47691935f46e13d9643c7ba5b617aec851e47
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body text and embedded links suggest a lure related to a 'bucknell campus map pdf', which redirects to 'https://ttraff.cc/pify?keyword=bucknell+campus+map+pdf'. This indicates a phishing or scam attempt designed to lead users to malicious sites. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence score support the malicious verdict.

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=bucknell+campus+map+pdf
    • http://files.ljsaudioequipment.com/uploads/1/3/1/6/131637014/5122479.pdf
    • http://files.gabriela.is/uploads/1/3/2/6/132681698/fuwexubekoli.pdf
    • http://files.grassingtondevonshireinstitute.org/uploads/1/3/1/4/131437161/b310fedc22d9ef0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/nezofirewoxovufigez.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/85_chevy_c10.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/mawiminujudujixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/divuxatafize.pdf
    • https://cdn.shopify.com/s/files/1/0437/3390/9665/files/wijukagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/padidevisube.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/daberomo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/54592767930.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/pinirizupora.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/vaduwunozotigegulazete.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/30496578071.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/minunedegexanodezoxaruva.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/tafsir_quran_afaan_oromoo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/siserujer.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_off0000a55d.bin
6d9a29cc75ec9f714c2f2b8daaea12cc3fb09c97152b0e6e2d898bea73bb937c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA55D 5316 bytes
font_01_sfnt_off0000b76c.bin
14ad62ccf3aa8d743de5c6133a4e61387177b9b4ecefccd086e845826bbbff44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB76C 12628 bytes

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