Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b4ed5afae28d3…

MALICIOUS

PDF

44.7 KB Created: 2020-08-04 23:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c739f7daa14cf45b2b4f72152381ead2 SHA-1: 2f3bda8eff5e3e3122c5b8617410796a725b7055 SHA-256: 440b4ed5afae28d3b027de303343618da8f7717f7e7d49f0cb6d90561a73d01f
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains a URL that leads to a redirector service, which is likely used to distribute malicious content or conduct phishing attacks. The presence of numerous external links, many hosted on Shopify, suggests an attempt to manipulate search engine results or lure users to malicious sites.

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=curso+base+de+dados+pdf
    • http://files.edwardcooperrealty.com/uploads/1/3/2/6/132681976/gepepa-geleviwo-bopekobi.pdf
    • http://files.newmarlboroughfiber.org/uploads/1/3/0/7/130739214/3267626.pdf
    • http://files.mylincolnmusic.com/uploads/1/3/0/9/130969573/judofe_latefeze.pdf
    • http://files.assurance-realtor.com/uploads/1/3/1/8/131857114/selalixitadexur.pdf
    • http://files.totallyrendang.com/uploads/1/3/1/3/131383743/a45309e1.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/24351156285.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/castle_amber.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/lotut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/mawep.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/migodik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0876/files/foopets_log_in.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdf
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/mojatoporonex.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/65828627441.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/fowewijusujigefok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006123.bin
74f55ad2484f6319977e49a9f643b353f64b7457652d36d0758016f832410c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6123 4812 bytes
font_01_sfnt_off00007185.bin
c741e628a5a796e7179b27dac9fbfda60f6e6b3aaad9ff4f7dd6180f2bb6785b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7185 11328 bytes
font_02_sfnt_off00009670.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9670 4324 bytes

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