Malicious PDF — malware analysis report

Static analysis result for SHA-256 20620b76cf0c9b40…

MALICIOUS

PDF

39.3 KB Created: 2020-08-02 15:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfdf63dfe1e820a9bdc05a973b2e60ff SHA-1: 6f568eb877cb9c709cc42a7959c7727183e3ea9c SHA-256: 20620b76cf0c9b4096cdd3d702355e442ed111711922f9bcf92d2a45c42ad015
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a redirector that is associated with malicious activity, specifically a 'Lowes paint rebate' lure. The document body also contains this lure and numerous other links, many hosted on Shopify, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a phishing or scam campaign.

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=lowes+paint+rebate
    • http://files.suepaton.net/uploads/1/3/0/8/130874066/kalumeduk.pdf
    • http://files.anxietytreatmentqueens.com/uploads/1/3/1/8/131871894/7685176.pdf
    • http://files.magdazaslona.com/uploads/1/3/0/7/130776206/3c34241.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/47975443757.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/71694629096.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/66930545469.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/90664462769.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/25087579364.pdf
    • https://cdn.shopify.com/s/files/1/0430/3280/5527/files/98687369796.pdf
    • https://cdn.shopify.com/s/files/1/0440/4723/7285/files/9ca88ee3-_acb7-_47c8-_afc4-_ab702511c276.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/pupejajelaku.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_off00005bad.bin
0c38a0809ef5d5548747eacecd88a4ab393f5febb3ee7c58f74880cac0eb9fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAD 4956 bytes
font_01_sfnt_off00006ca8.bin
33ece3fd171d08f89b9e0c0bd563bb6add7135ad3a1f40a766e32fa83a850d02
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA8 10556 bytes