Malicious PDF — malware analysis report

Static analysis result for SHA-256 a838cefdd907e224…

MALICIOUS

PDF

49.4 KB Created: 2020-08-12 05:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9adbfc6a8f9a9b7f22bd1bf7281ed185 SHA-1: 32d09b82ac4bd00ce97c644ebcca17ea81ed5349 SHA-256: a838cefdd907e22405f3409f6fd0f0e77c04de5e741b55dfb25e414f0020efc6
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary link directing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting the intent is to drive traffic to this malicious site. The ML classifier also strongly indicated maliciousness.

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=academic+performance+meaning+pdf
    • http://zojas.inkybluestudio.com/uploads/1/3/0/8/130874474/nenalidobebupas_mikunazatow_ruvonasik.pdf
    • http://files.ngsspln.com/uploads/1/3/1/0/131070867/befut_luliramuv_ruvot.pdf
    • http://files.allthethingswithaj.com/uploads/1/3/2/7/132740457/e20ce128a.pdf
    • http://files.wcchakrahealing.com/uploads/1/3/1/3/131381374/8786177.pdf
    • http://nopetexo.purplelotusspiritualhealinginc.com/uploads/1/3/1/0/131070450/besopakasabodi-kuneginipifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/rent_agreement_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/lutafitidomojakeze.pdf
    • https://cdn.shopify.com/s/files/1/0439/4024/9755/files/36512984780.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/vocabulary_exercises_for_elementary_level.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/54583217499.pdf
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/4427108207.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/54082016887.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/50876424315.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/monazata.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/76080797509.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/raxiwubavowexalufuxowe.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_off0000849a.bin
3169a0af09af3dd5e66d5eb090fb4c4a5eb073052e95b6bd7579d328fa6cbe57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849A 5256 bytes
font_01_sfnt_off00009660.bin
550ffeccecb0dd1b8a7d8a9b98c96ab7345f375ad8e9c110e6848bcdd2fbcfbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9660 10120 bytes

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