Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b81f2fd09a5b189…

MALICIOUS

PDF

48.9 KB Created: 2020-08-02 20:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 359cd57b2a24e6ea4c303a48195446af SHA-1: 514be7021105b754c71b4108124157857760ae57 SHA-256: 8b81f2fd09a5b189aac2cac8a658a215537283c873a504b2459e4b9eedce2032
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to embedded links pointing to known malicious redirector infrastructure. The document body contains a URL that appears to be part of a link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to obscure the final malicious destination. The ML classifier strongly supports 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.ru/pify?keyword=tool+72826+songs
    • http://files.freemaninsure.com/uploads/1/3/0/8/130874324/sosowor_peresixosixar_rejerugovije.pdf
    • http://files.sheetmaskshop.com.au/uploads/1/3/0/7/130776883/7143677.pdf
    • http://files.jplotitocompany.com/uploads/1/3/0/8/130814172/0ff6d0a.pdf
    • http://files.colquitt-georgia.com/uploads/1/3/0/7/130776578/tonogopaxexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/synonyms_for_collapse.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/pivolusawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/52072146841.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2070/files/35347372362.pdf
    • https://cdn.shopify.com/s/files/1/0433/3151/8622/files/3955073691.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/70743658341.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/wopazidesenibegenaruso.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/ledunuxupafajofitok.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/94039615118.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/kutanedagofelexun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/49875383151.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/46181187643.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/
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/wopazides

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007215.bin
4f5f909260e72a638b573601a045db9e7a1d3de83c623e40943378318dce4617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7215 4252 bytes
font_01_sfnt_off0000811d.bin
88b2ba74bd72f13dcea44d2a27ce8bf33cdeca7040309d86ed9632e6395d4081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811D 5056 bytes
font_02_sfnt_off00009274.bin
d7c52b1906a777440440144d7bb7af60f6a27cebe07f31addf71b942f2525a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9274 10384 bytes

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