Malicious PDF — malware analysis report

Static analysis result for SHA-256 259a85559464cd34…

MALICIOUS

PDF

40.7 KB Created: 2020-08-19 23:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 990a3ca91b20f0b4a042933875ce0a6c SHA-1: a388eed9a8a0d2fdc2ebb4bb8642f97a41d4513b SHA-256: 259a85559464cd340947fc5e79a903d6101b95f781220399cc80464cdfcda2c4
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO manipulation or to obscure malicious destinations. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=lcm+and+gcf+worksheets+for+4th+grade'. The document body, though partially corrupted, contains text related to 'lcm and gcf worksheets for 4th grade', suggesting a lure to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=lcm+and+gcf+worksheets+for+4th+grade
    • http://files.nowloadingnews.com/uploads/1/3/1/6/131606636/zozafopip.pdf
    • http://files.oneburgh.com/uploads/1/3/0/7/130775180/lesonilaxalejupa.pdf
    • http://files.juliemartincounseling.com/uploads/1/3/2/8/132816202/3593556.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/53856884441.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/radufezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/daxudanikatisavasunegul.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1389/files/25392136836.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/jagidota.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/vimesekonek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/giterenodaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/keviban.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/21399135209.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/digital_design_morris_mano_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0449/1480/2855/files/mariadb_for_windows.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_off000060ad.bin
546a80722c2fc01eb260c9b592224f54b064a54594f484ca8888ec8a3eb8b9ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 5588 bytes
font_01_sfnt_off000073a0.bin
4b871f3b63adffc3365f6280b3bbf3d69403d9ca72cf48525121ebcdae7d8194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A0 10040 bytes

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