Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eb15baf2c247f0…

MALICIOUS

PDF

52.5 KB Created: 2020-08-01 03:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07598d58c4134e583e685f379ff2e51 SHA-1: f1457afbb1690525ddb917d6ec15df9b009ba3c3 SHA-256: 35eb15baf2c247f05d14db370f676a620c5ee19ce598578a5aca2de5da6b0670
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text related to 'letter of intent graduate school' and a URL that appears to be a malicious redirector. This suggests the document is designed to trick users into clicking malicious links, likely leading to further compromise.

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=letter+of+intent+graduate+school
    • http://files.quincytownship.org/uploads/1/3/2/3/132302978/kefake.pdf
    • http://files.theshopatsweetwater.ca/uploads/1/3/0/9/130969298/404e381d26.pdf
    • http://files.toddchang.com/uploads/1/3/1/4/131407625/tewonitokuw.pdf
    • http://files.isawyournutsmommy.com/uploads/1/3/1/3/131383549/49293f2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0532/1109/files/rumulinijosivilelaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/zakib.pdf
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/7949972577.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/dilafojipopatenirisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/32251794363.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/9277292426.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/miperubububuzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/84139380820.pdf
    • https://cdn.shopify.com/s/files/1/0430/8077/7882/files/kivugab.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/5532364117.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/72862588408.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/xoregitodofise.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/dimaxokodaximijosinimega.pdf
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/3451362112.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_off00009095.bin
fdf9d9a56e0b2ec92940a7ba5a60c929b6fbb02013b0edd7d1219303e34e9851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9095 5224 bytes
font_01_sfnt_off0000a25c.bin
57534aadb6e3973a9f0a9861a5bf83708afa3ce884e2651ddeb8c5063a217292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA25C 10036 bytes

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