Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec822e2c40cecdb4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-22 13:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b031b47f156e17fe3105cbf3dea9a13b SHA-1: c6347ec4d1de04e0c2fde32355198f534e0207ee SHA-256: ec822e2c40cecdb4ff87f90c73f40915d601c57947b5226bb8d5bc116671bf42
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an SEO spam or phishing lure. The primary malicious URL identified is ttraff.ru, which is known to host redirectors.

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=patofisiologi+patent+ductus+arteriosus+pdf
    • http://files.sharidellapenna.com/uploads/1/3/0/8/130813988/romijojeledatuxusepo.pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://files.afrogood.com/uploads/1/3/2/7/132740836/ab98a741.pdf
    • http://files.richardmccooey.org/uploads/1/3/2/6/132695741/eef02688ec10c5.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/carcinoma_basocelular_elsevier.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/wonijixam.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/malug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/almanach_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/69420246052.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sibubemazalomasedexikeme.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/56028971968.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/coliformes_fecais.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/84825022799.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/90669112336.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/aciclovir_eye_ointment.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_off00006008.bin
f13dacf2c96299fb0d4e0fecf3af08625a5f3bbfe0c96f90715a4c39c3324e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6008 5324 bytes
font_01_sfnt_off00007230.bin
98342a11e4c06879f79a5590fe81f0f560e2a3f202521b9de2242f5d66ab915e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7230 9672 bytes

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