Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52959b42128578c…

MALICIOUS

PDF

45.8 KB Created: 2020-08-25 14:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a22ac1d316e75ebfcf7a0920ec4e51c9 SHA-1: 07f7cdb0fa25e4d4b5341fc2b81914e84636a1bf SHA-256: c52959b42128578cef486ab98298269995e96fb103e4336edaf414d079dc9533
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as an answer key. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, directing the user to a malicious URL under the guise of providing requested information.

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.com/pify?keyword=cambridge+english+for+the+media+answer+key
    • http://files.cwi2.com/uploads/1/3/1/4/131438056/vekopebatal_bupib_gasudejokop.pdf
    • http://files.niagaraadvantage.ca/uploads/1/3/2/6/132681969/mexadugigawoboj_gapapasu.pdf
    • http://tidipojep.sigmachapter.org/uploads/1/3/2/8/132814930/nipakamepuwuvuj_padubuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/97079210713.pdf
    • https://cdn.shopify.com/s/files/1/0434/0419/8038/files/heparin_drip_protocol_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/8873/9494/files/86150537986.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/kezurutuganiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/19124708286.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/62185730724.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/witcher_3_reshade.pdf
    • https://cdn.shopify.com/s/files/1/0435/6177/9359/files/examples_of_applicable_financial_reporting_framework.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/bodobuwunuvobirado.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/catalogo_natura_ciclo_14_2020.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_off000072a8.bin
6e07f0c0a620f099ebc2e5dffce0e7b333ae5f33cba3a16ec8d246913072b7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A8 5624 bytes
font_01_sfnt_off000085b7.bin
d37da0f17bea9d4dd4ae90d2faf44754159d2f2e82d66154dbd76a810fec962f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B7 10748 bytes

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