Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab5a2a509d9d67a…

MALICIOUS

PDF

42.1 KB Created: 2020-07-12 02:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbc5cbc04630195bd097895492cf9a15 SHA-1: f1a9caca6955868e0d4aadad1ca568c4b9651c1c SHA-256: 6ab5a2a509d9d67ac030365dccd7d1b2a88feda0afd37a2388d00f96c5797237
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on external domains, indicating a link farm or SEO manipulation tactic. One of the primary links redirects to a known malicious infrastructure, suggesting the document is used to distribute malware or engage in phishing. No scripts were extracted, but the presence of numerous external links and the malicious redirector strongly suggest malicious intent.

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/wb?keyword=encounters%20with%20jesus%20tim%20keller%20pdf
    • http://files.csoaf.com/uploads/1/3/0/7/130775186/9552357.pdf
    • http://files.indonesianorphanages.org/uploads/1/3/0/7/130739239/jugik.pdf
    • http://files.ecovalleyconstruction.com/uploads/1/3/1/6/131606173/3b36f003751add.pdf
    • http://files.newbeginningswalworth.com/uploads/1/3/0/7/130776841/tunanazopab.pdf
    • http://files.lairdnorton.org/uploads/1/3/1/6/131606059/baxikisid-sawave-mobubipigozewo.pdf
    • http://files.newdaytherapies.com/uploads/1/3/2/6/132695836/tazazupojabiwenow.pdf
    • http://files.namioncampusuno.com/uploads/1/3/0/7/130739883/buteninolemenagup.pdf
    • http://files.northshropshirelabour.org/uploads/1/3/1/8/131857650/jajolar.pdf
    • http://files.duanebrownlaw.com/uploads/1/3/1/4/131483253/2887604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jevezuvexog.files.wordpress.com/2020/07/37695737397.pdf
    • https://bofisoj.files.wordpress.com/2020/07/xugesugijozasavebisepix.pdf
    • https://jadunupugali.files.wordpress.com/2020/07/38896625533.pdf
    • https://lojategi.files.wordpress.com/2020/07/zevadidofuboba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98690712505.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/20116781325.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/14458921873.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/tamujiberapomutafajijegi.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_off00006743.bin
dedb1ab5e6bf11a6b1ab0e3edac662e253d297898b5498b06b57f70e5be1fb7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6743 5256 bytes
font_01_sfnt_off00007908.bin
e3836d2e2dc3207aa9356b30c9737c194d428df21c856ecc03b36df2bcdbd366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7908 9988 bytes

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