Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff1bfa4417eb3ee…

MALICIOUS

PDF

44.3 KB Created: 2020-08-12 01:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55dbe2bb361f31677217eced3b6efc3 SHA-1: 42a92a79269517755f24c8551e8419ecf5130d7a SHA-256: eff1bfa4417eb3ee70f6c193ef1830aed0317298813e190130468873da9626c9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a critical redirector link disguised as a search result for 'causes of pollution in mumbai city pdf'. This link, https://ttraff.cc/pify?keyword=causes+of+pollution+in+mumbai+city+pdf, leads to malicious infrastructure, indicating a phishing or social engineering attempt to redirect the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious.

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=causes+of+pollution+in+mumbai+city+pdf
    • http://files.adec322.com/uploads/1/3/0/7/130776646/2814331.pdf
    • http://zowosas.windsoressexcpr.com/uploads/1/3/1/4/131437423/fuxilirawuroluxevas.pdf
    • http://bimemotak.equineassistedtherapyofnj.org/uploads/1/3/1/4/131409090/1491385.pdf
    • http://files.woodland-bc.com/uploads/1/3/0/7/130775633/7656854.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/apprendre__crire_l_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0440/3032/8997/files/nabefevevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/ancient_history_encyclopedia.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/better_call_saul_s04e09_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0438/5013/7760/files/adjectives_to_describe_appearance_and_personality.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/lonamilugukaxafodo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6827/5353/files/10050643365.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/14941191655.pdf
    • https://cdn.shopify.com/s/files/1/0434/2523/5111/files/lifipikofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0443/3244/9948/files/39657861871.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/vadelenapixodos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/93196331165.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e93.bin
669ee2b2bb35400276586495118ce73c0939c507f63d08191a8c47667c9b7734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E93 5352 bytes
font_01_sfnt_off000080bb.bin
16dafe7064ffa392eec3f265798ab55265c7e6a38ecfb8406bf0324817f809ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BB 10304 bytes

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