Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bd2fafa4e841e0…

MALICIOUS

PDF

51.0 KB Created: 2020-07-10 10:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c957b66a4bfc12d490e3ced43ee46e0 SHA-1: b97a1ff9188ca0c4df976ffbee1d5c74708dbbb4 SHA-256: 89bd2fafa4e841e036383f4d2ff8680cfb586906ae9e85ef6e45cf28d1554cec
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting a link-building or redirection scheme. One critical heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, indicates that one of the embedded links points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve to distribute further malicious content or to manipulate search engine results.

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.com/wb?keyword=palaeontology%20books%20pdf
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdf
    • http://files.wpcbuildingservices.com/uploads/1/3/1/6/131636954/togekoj.pdf
    • http://files.whitecloudsweb.com/uploads/1/3/1/8/131856624/3477828.pdf
    • http://files.4-ucorp.com/uploads/1/3/0/7/130739567/7385382.pdf
    • http://files.novaqueue.com/uploads/1/3/2/6/132696280/xadowozaludujamozi.pdf
    • http://files.networklakestevens.com/uploads/1/3/1/4/131438439/rowesiz_wusexaf_sutatadurix_monejope.pdf
    • http://files.gardeniahomedesign.com/uploads/1/3/1/8/131871786/faxujorefikizuf.pdf
    • http://files.notaryservicesetc.com/uploads/1/3/2/6/132681296/tejatotoz.pdf
    • http://files.tp4seniors.ca/uploads/1/3/0/8/130814652/tobugolamid.pdf
    • http://files.ftpiercemasons.org/uploads/1/3/2/6/132682042/lituxa.pdf
    • http://files.tlc-tree.com/uploads/1/3/1/1/131163774/8344923.pdf
    • https://burelixub.files.wordpress.com/2020/07/jebov.pdf
    • https://xilogip.files.wordpress.com/2020/07/42115605979.pdf
    • https://lovugamu.files.wordpress.com/2020/06/dejedazodorewarivo.pdf
    • https://gapepuzowafu.files.wordpress.com/2020/06/28209240673.pdf
    • https://dezakoz.files.wordpress.com/2020/06/98577206933.pdf
    • https://gavomibew482746657.files.wordpress.com/2020/06/59155071864.pdf
    • https://kokabejiwe.files.wordpress.com/2020/07/jedigozax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.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_off000081c7.bin
9da8c03d820cdae2d376348d3ac161a0ab437282c031e277d0ddd0f30644f43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 5160 bytes
font_01_sfnt_off0000936b.bin
beb6d5a9039ebdf981f285f04f9c4ae88236ce235f6c90160a103b2bbf47c43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x936B 13672 bytes

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