Malicious PDF — malware analysis report

Static analysis result for SHA-256 31540c16a0cebdaa…

MALICIOUS

PDF

33.3 KB Created: 2020-07-09 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b77227ec26fd52d104380c7406cd1432 SHA-1: db0255d3a111335bf66592e49b46e00c4ee633b9 SHA-256: 31540c16a0cebdaabae878cbbb742be12eb647f387330d5af31aa660deb2fb4a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm designed to improve search engine rankings for malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Table calendar design 2020 pdf' and includes the primary malicious URL, suggesting a lure to a phishing or malware distribution site.

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.cc/wb?keyword=table%20calendar%20design%202020%20pdf
    • http://files.praxismartialarts.com/uploads/1/3/1/6/131606670/gidebobevoxi.pdf
    • http://files.lisaphillipsrmt.com/uploads/1/3/2/3/132303075/duzopotegi.pdf
    • http://files.graceandtaylor.com.au/uploads/1/3/1/8/131871526/66889.pdf
    • http://files.kristinbruni.com/uploads/1/3/1/6/131606395/wevawujok-gapavefevumolo-noditimu-siwaseviwi.pdf
    • http://files.jessicafleck.com/uploads/1/3/1/3/131380875/buzesutimon.pdf
    • http://files.hollypham.com/uploads/1/3/1/4/131408528/9826977.pdf
    • http://files.levelctactical.com/uploads/1/3/1/1/131164567/xidodufux.pdf
    • http://files.eudaimoniatravelblog.com/uploads/1/3/1/4/131407807/bofovajogom_felab_denirojatagar.pdf
    • https://divosurepewa.files.wordpress.com/2020/06/rafuzatiwalepow.pdf
    • https://wiwozufof.files.wordpress.com/2020/06/jaxeped.pdf
    • https://nojowijede.files.wordpress.com/2020/06/58665651441.pdf
    • https://nalakemad.files.wordpress.com/2020/07/vawatakaruluvotivi.pdf
    • https://guzedaf.files.wordpress.com/2020/06/famuve.pdf
    • https://tawutetamazo.files.wordpress.com/2020/06/zematuwutaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pitoparejiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixiridujafogidubiba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.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_off0000485d.bin
4389cbddf7922902a07a4d8808cc148b9b96ab3e6525dece844d7b37b677704b
pdf-font-stream PDF embedded font (sfnt) at offset 0x485D 5284 bytes
font_01_sfnt_off00005a4d.bin
490082bea34b8aa89ce42dab466744a50f6c6d62901958cf29e61924606fc657
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4D 8724 bytes